Pec

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(?) is the most neglected subject by electricians, electrical inspectors, maintenance construction engineers, design engineers and many other members of the electrical industry in making electrical installations in the field, maintenance of factories, building or substations.

Back 1

Electrical Grounding

Front 2

Faulty electrical grounding results in what we called

Back 2

“dirty electricity”

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An Act For, A More Responsive and Comprehensive Regulation For the Practice, Licensing, and Registration of Electrical Engineers and Electricians.

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R. A. 7920

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The Board shall exercise executive /administrative or quasi-legislative (rulemaking) or quasi-judicial (investigative) powers in carrying out the provisions of this Act.

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Sec. 4 Powers and Duties of the Board

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 The Board shall have the power, upon proper notice and hearing, to revoke any certificate of registration of any registrant, to suspend him from the practice of the profession or to reprimand him for any specified in the preceding section, or for the use of perpetration of any fraud or deceit in obtaining a certificate of registration, or for gross negligence or incompetence or for unprofessional or dishonorable conduct, for violation of this Act, the rules and regulations and other policies of the Board and the Code of Professional Ethics.

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Sec. 29. Revocation of Certificates of Registration and Suspension from the Practice of the Profession.

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 Definition – a permission granted by competent authority to engage in a practice of profession or business or in an activity.

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Licensing

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A PEE who designed, signed, and sealed an electrical plans – means he/she guaranteed the safety of the electrical plans for (?)

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for 15 years in accordance to Civil Code.

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Components that Create a Fire or Explosion

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FUEL, IGNITION SOURCE, OXYGEN

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The first documented case of a Code as a requirement of rules was published on ----- and entitled -----

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16th Nov. 1881 entitled “The Dangers of Electric Lighting”.

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The first NEC was developed in 1897, eighteen after the invention of incandescent light bulb by

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Thomas A. Edison

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Since 1911, the NFPA of -- has been responsible for the maintenance and publication of the NEC.

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Quincy, Massachussets,

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Regularly revised every (?) years to reflect the evolution of products, materials, and installation techniques.

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(every three years)

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(?) separate commitee each consisting of 15-20 persons. Members of each committee meet several times, discuss proposed changes, accepting some and rejecting others, and rewrite (as required) the sections of the Code that were assigned to their committee.

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21 Separate Committee

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CLASSIFICATION OF CODE RULES

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1. Wiring Design Rules

2. Installation Rules

3. Manufacturing Rules

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a code rule used to determine sizes and rating of circuit conductors and devices.

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Wiring design rules

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capable of having reach without having to climb over or removed obstacles or ladders

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Accesible, readily

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(?) Current in excess in equipment caused from an overload short circuit or ground fault.

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Overcurrent

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– The conductors from the service point to the service disconnecting means

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Service Conductors

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(?) The overhead service conductors from the last pole or other aerial support to and including the splices, if any, connecting to the service entrance conductors at the building or other structure.

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Service Drop

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Underground system showing ---- run from a pole and from a transformer.

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Service Lateral

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does not apply to service drop or service lateral conductor la under the exclusive control of the electric utility .

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PEC 1

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Splices in railway Sec. 300.13 (A)

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VIOLATION

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Splices or taps are not permitted in the raceways

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Wiring Methods

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Unused openings for circuit breaker must be closed using

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identified closures or other approved means

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Internal parts of electrical equipment must be covered to avoid damage from paint or other substances.

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Integrity of Electrical Equipment

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corrosive liquid and fumes can damage the equipment

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Deteriorating Agents

Front 27

Controller is just 5000 A and Available Fault Current is 7500 A what rating is this?

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Short-Circuit Current Rating

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one wire per terminal

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Conductor Termination

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(?) Splices Joints and free ends of all conductors must be covered with insulation that is equal to that of the conductor

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Conductor Termination

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Conductors must be spliced by a listing splicing device and they are NOT required to be twisted together prior to the installation of a twist-on wire connector.

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Conductor Splicing

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Equipment rated 100A or Less

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Conductor Sizing

Front 32

the (?) in the kitchen and Wall Spaces 600 mm (2 ft) in Width-210.52(A)(2)(1), Maximum distance 6 Ft (18mm)

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Receptacles

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Human completing the path for current the earth, Human in parallel with equipment grounding conductor during groundfault is what we called (?)

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Electric Shock

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Electric Shock  Electric Shock Severity

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1. Path of Current through Body 2. Length of Time Current Flows 3. Amount of Current through Body

Front 35

what is Ground Fault Circuit Interrupter

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 GFCI – A device intended for the protection of personnel that functions to deenergize a circuit or portion thereof within an established period of time when a current to ground exceeds the values established for a device.  The GCFI does not protect someone against receiving a electrical shock, but it does limit the time hazards exists. Hazard exist only during period of time fault is there.

Front 36

GFCI IS DESIGNED FOR

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A GFCI is designed to protect persons against electric shock. It operates on the principles of monitoring the unbalanced current Between the ungrounded and the grounded neutral conductor.

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Gfci placed in

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Bathroom, garage, outdoor, basement

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A ---- is required before undertaking any electrical installation.

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Permit

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An --- is also required after which certificate of final electrical inspection (CFEI) is issued by the authority

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inspection

Front 40

A permit is not required for;

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 The installation of electrical portable equipment rated not more than 1,200 VA.  Reconnection of disconnected service due to non-payment of electric bill or change of occupants for a period of one year.

Front 41

An application form (DPWH form No. 77-001-E) shall be accomplished, signed and submitted by a duly registered Professional Electrical Engineer. However, installation does not exceed ------------, the application may be prepared, signed and submitted by a duly registered electrical engineer ormaster electrician.

Back 41

20 lighting and/or receptacle outlets or 4000volt-amperes, 230 volts,

Front 42

How many sets of plans and specifications bearing the signature and seal of the responsible Professional Electrical Engineer shall be submitted together with the application

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Five (5) sets

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According to P.D. ----, no plans is required for building made of indigenous materials or which cost is not more than ----

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1096, than P15, 000.00.

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SERVICES No. of Service

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- A building or other structure served shall be supplied by only one service.

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This ---- conductor from the last pole or other aerial support to and including the splices if any, connecting the service entrance conductors at the building or other structure.

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THE OVERHEAD SERVICE-DROP

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Service drop shall have sufficient ampacity to carry the load without a temperature rise detrimental to the covering or insulation of the conductors and shall have adequate mechanical strength. Minimum Size. The conductors shall not be smaller than

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8 mm2 copper, 14 mm2 aluminum or copper- clad aluminum

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Above Roofs. Conductors shall have a vertical clearance of not less than the clearance of

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2,500 mm from the roof surface

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Vertical Clearance from Ground. - at the electric service entrance to buildings, or at the drip loop of the building electric entrance, or above areas orsidewalks not less than the clearance of

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3,100 mm

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- for those areas listed in the 4,600 mm classification when the voltage is limited to 600 volts to ground not less than the clearance of

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3,700 mm

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--- over residential property and driveways, and those commercial areas not subject to truck traffic not less than the clearance of

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4,600 mm -

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- over public streets, alleys, roads, parking areas subject to truck traffic, driveways on otherthan residential property, and other land transversed by vehicles such as cultivated, grazing, forest, and orchard not less than the clearance of

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5,500 mm

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-This is the underground service conductor between the street main, including any risers at a pole or other structure or from transformers, and the first point of any connection to the service-entrance conductors in a terminal box or meter or other enclosure with adequate space, inside or outside the building wall.

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UNDERGROUND SERVICE-LATERAL CONDUCTOR

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(?) Service-lateral conductor shall withstand exposure to atmospheric and other conditions of use without detrimental leakage of current

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INSULATION

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a) General. Service lateral conductors shall have sufficient ampacity to carry the current for the load and shall have adequate mechanical strength. b)Minimum Size. The conductors shall not be smaller than ----

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SIZE AND RATING, 5.5 mm2 copper or 8.0 mm2 aluminum or copper-clad aluminum.

Front 55

-- is defined as the portion ofthe supply which extends from the street main duct or transformer to the service switch or switchboard ofthe building supply.-it is the conductor and equipment for delivering energy from the electricity supply system to the wiring system ofthepremises served.

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Service Entrance

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The most common type of service entrance employed by the power companies supplying electricity which is either a 2, 3 or 4-wire connection. Generally, the overhead service cable between the building property line and the supply point is supplied by electric company to a limit of 30 meters

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Overhead Service Entrance

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The (?) consists of a raceway conduit extending from the building to the property line whereit is tapped to the main. The type of cable recommended is the underground service entrance cable commonly referredto as USE.

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The Underground Service Entrance

Front 58

- No. of Service-Entrance Conductor Sets Each service drop or lateral shall supply only ---- conductors

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one set of service-entrance

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EXCEPTIONS: 1.Buildings with ----- 2.Where two to ----- in a separate enclosures are grouped at one location and supply separate loads from one service drop or lateral.

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more than one occupancy., six service disconnecting means

Front 60

Service entrance conductors shall be of sufficient size to carry the computed loads. Ungrounded conductors shall not be smaller than:

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1.100 A ---- For one family dwelling with six or more 2-wire branch circuits. 2. 60 A ---- For one family dwelling with an initial computed load of 10 kVA above. 3. 40 A ---- For otherloads.

Front 61

1.Forloads consisting of not more than 2 - wire branch circuits, 5.5 mm2copper or 8.0 mm2 aluminum or copper-clad aluminum. 2.By special permission, forloads limited by demand or by the source of supply, 5.5 mm2 copper or 8.0 mm2 aluminum or copper-clad aluminum.

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Size rating exceptions

Front 62

Service entrance conductors shall be installed in accordance with the applicable requirements of thisCode covering the type of wiring method used and limited to the following method:

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1.Open-wiring on insulators

2. Rigid Metal Conduit (RMC)

3. Intermediate Metallic Tubing (IMT)

4. Electrical Metallic Tubing (EMT)

5. Service-Entrance Cables 6.Wireways, 7. Busways, 8. Auxiliary gutters

9. Rigid Non-Metallic Conduit (RNMC)

10. Cable Bus

11.Mineral-Insulated Metal-Sheathed Cable , 12. Type MC Cables

Front 63

Service entrance conductors subjected to physical damage shall be protected in any of the following ways or methods:

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1.By RMC

2. By IMC

3. By RNMC suitable for the location

4. By EMT

5. Type MC cable or other approved means

Front 64

(?) The (?) disconnecting means shall be provided to disconnect all conductors in abuilding or other structures from the service-entrance conductor.

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The service equipment disconnecting means general

Front 65

The service disconnecting means for each set or each subset of service entranceconductor shall consist of not more than (?) mounted in asingle enclosure, or in a switchboard.

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six switches or six circuit breakers

Front 66

The service disconnecting means shall be installed either inside oroutside the building or otherstructure at a readily accessible location nearest the point ofentrance of the service entrance conductor is what we called (?)

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Location

Front 67

The service disconnecting means shall have a rating of not less than the load to be carried. In no case shall the rating be lower than specified through what we called (?)

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Rating

Front 68

-(?)-installation that the service disconnecting means shallhave a rating of not less than 15 amperes.

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One circuit installation

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-(?)- Installation that The service disconnecting means shall have a rating of not less than 30 amperes.

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Two circuit installation

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-- The service disconnecting means shall have a rating of: 60 A -- where the initial computed loads is 10 kVA or more 100 A -- where the initial installations consist of six or more 2-wire branch circuit.

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One family dwelling

Front 71

For all other installations, the service disconnecting means shall have a rating of not less than 40 amperes.

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Others

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FEEDERS AND MAIN Essential considerations being adapted or followed. 1.On large installation, --- feeder is provided for each floor.

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one

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2. In small installations, ----- feeders is satisfactory.

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one or two

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3. Feeder for motor must be ---- and ----- from the light circuits.

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separate and independent

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4. Feeders requiring more than -- mm -- conduit should not be used.

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50 mm diameter

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5.Feeders should be --- if there are several bends or offsets because a 50 mm conduit is the largest that could be economically used.

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subdivided

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Feeders radiating from the distributing panel should be provided each with a properly rated with

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switch and circuitbreaker.

Front 78

Good practice dictates that feeders and main -shall be installed (?) a conduit pipe as it carries high voltagethat should be well protected.

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inside

Front 79

Is a single panel or group of panel units designed for assembly in the form of a single panel.

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A panelboard

Front 80

is the feeder interior wiring extending from service switch, generator bus, or converter bus to the main distribution.

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Main

Front 81

- is defined as the circuit conductorsbetween the final overcurrent device protectingthe circuit and the outlets, wiring between the circuit overcurrent protection device such as fuses or circuit breaker and theoutlets

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BRANCH CIRCUIT

Front 82

Any current in excess of the rated current capacity of the equipment or the rated ampacity of the conductoris called .

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overcurrent

Front 83

The causes of overcurrent are:

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Overload in the equipment conductors. Short circuit or ground fault As per PEC requirement, conductors shall be protected against overcurrent in accordance with their ampacities (Art. 4.5.1.3) Ampacity - is the current-carrying capacity of an electric conductor

Front 84

A --- is an overcurrent protective device also designed to function as a switch. It is equipped with an automatic tripping device to protect the branch circuit from overload and ground fault.

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circuit breaker

Front 85

is also an overcurrent protective device with a circuit opening fusible element which opens when there is an overcurrent in the circuit. It is considered as the simplest and the most common circuit protective device used into the house wiring connection.

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FUSE

Front 86

are substances that offer a very low resistance to current flow.

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Electrical Conductors

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are substances that offer a very high resistance to current flow.

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Insulators

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List of some good electrical

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conductors

Silver Platinum zinc

Copper Iron

Aluminum Tin

Nickel Brass

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List of some insulating materials

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Rubber , Glass , Asbestos

Porcelain , Mica , Thermoplastics

Varnish , Latex , Paper , Oil

Slate , Paper , Oils , Wax , Dry , air

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Wires are those electrical conductors which are --- or smaller, while cables are those larger than the wires. They are called

Back 90

8 mm2 (AWG no. 8)

They are either solid or stranded.

Front 91

consists of a group of wires twisted to form metallic string. The total circular-mil area of a stranded wire is found by multiplying the circular mil area of each strand by the total number of strand.

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Stranded wire

Front 92

is the term given to an insulated stranded wire

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Cord

Front 93

This is the unit of cross section in the American wire gauge. The term “mil” means onethousandth of an inch (0.001 in.)

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CIRCULAR MIL

Front 94

DIFFERENT TYPES OF CABLES that --- type of cable, the type AC is a fabricated assembly of insulated conductors enclosed in flexible metal sheath. --- is used in both exposed and concealed work.

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Armored Cable

Front 95

Cable of the type MC is a factory assembled cable of one or more conductors, each individually insulated and enclosed in a metallic sheath of interlocking tape, or a smooth or corrugated tube. This type is used specifically for services, feeders, branch circuits, either exposed or concealed and for indoor or outdoor work.

Back 95

Metal Clad Cable

Front 96

This type of cable, type MI, is a factory assembly of one or more conductors insulated with a highly compressed refractory mineral insulation and enclosed in liquid tight and gas-tight continuous copper sheath. The type MI is used in dry, wet or continuously moist location as service, feeders or branch circuit.

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Mineral Insulated Cable.

Front 97

Types NM and NMC are factory assembled two or more insulated conductors having a moisture-resistant outer sheath, flame- retardant and nonmetallic material. These types are used specifically for one or two dwelling not exceeding 3 storey buildings.

Back 97

Nonmetallic Sheathed Cable.

Front 98

This type of cable, the type SNM, is a factory assembly of two or more insulated conductors in an extruded core or moisture-resistant and flame-retardant material, covered with an overlapping spiral metal tape. This type is used in hazardous locations and in cable trays or in raceways.

Back 98

Shielded Nonmetallic Sheathed Cable.

Front 99

This is a single conductor or multiconductor assembly provided with or without an over-all covering, primarily used for services and of the types SE and USE.

Back 99

Service Entrance Cable

Front 100

This is a single conductor or multiconductor assembly provided with or without an over-all covering, primarily used for services and of the types SE and USE.

Back 100

Service Entrance Cable

Front 101

This type of cable, the type UF cable is a moisture-resistant cable used for underground, including direct burial in the ground, as feeder or branch circuit.

Back 101

Underground Feeder and Branch Circuit Cables.

Front 102

Type TC cable is a factory assembly of two or more insulated conductors with or without associated bare or covered grounding under a metallic sheath. This is used for installation in cable trays, raceways or where supported by a messenger wire.

Back 102

Power and Control Tray Cable.

Front 103

This is an assembly of parallel conductors formed integrally with an insulating material web designed specifically for field installation in metal surface raceway. Cables of this type are the types FC.

Back 103

Flat Cable Assemblies

Front 104

This type of cable, type FCC consists of three or more flat conductors placed edge to edge, separated and enclosed within an insulating assembly. This used for general purpose, appliance branch circuits and for individual branch circuits specifically on hard, smooth, continuous floor surfaces, etc.

Back 104

Flat Conductor Cable.

Front 105

MV cable is a single or multiconductor solid dielectric insulated cable rated 2,001 volts or higher and is used for power systems up to 35,000 volts. The MV cables are of different types and characteristics

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Medium Voltage Cables.

Front 106

(?) are channels designed for holding wires, cables or bus-bars, which are either made of metal or insulating materials. The common types of raceways in household wiring are the a) conduits,

b) connectors, and c) others.

Back 106

RACEWAYS

Front 107

(?) pipes or tubings are the most common electrical raceway. According to the type of materials used, (?) maybe classified as either metallic such as steel pipes or nonmetallic such as PVC, and the like. According to its make, (?) maybe classified as: rigid metal, flexible metal, rigid nonmetal and flexible nonmetal.

Back 107

Conduits

Front 108

(?) is a metal sleeve usually made of copper that is slipped over and secured to the butted ends of conductors in making joint. A (?) is also called a splicing sleeve.

Back 108

Connectors

Front 109

(?) Aside from the conduits and connectors there are still numerous types and kinds of raceways, among these are the

a) conduit couplings, elbows and other fittings;

b) conduit supports, such as clamps, hangers,etc;

c) cable trays, cablebus;

d) metal raceways;

e)nonmetal raceways.

Back 109

Other Raceways

Front 110

An (?) is a point in the wiring system at which current is taken to supply utilization equipment. The kinds of (?) are: convenience (?) or attachment cap, lighting (?), and receptacle (?).

Back 110

outlet

Front 111

A (?) is a device which by insertion in a receptacle, establishes connection between the conductor of the flexible cord and the conductors connected permanently to the receptacle.

Back 111

convenience outlet or attachment cap

Front 112

A (?) is an outlet intended for direct connection of a lampholder, a lighting fixture, or a pendant cord terminating in a lampholder.

Back 112

lighting outlet

Front 113

A (?) outlet is an outlet where one or more receptacles are installed.

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receptacle

Front 114

TYPES OF WIRES A. TYPES (?,?,?) The most ordinary type of plastic insulated wire is the “type T”. It may be used only in dry locations. Some manufactures no longer make the ordinary Type T, instead produce Type TW, which is identical in appearance, but may be used in wet or dry locations. Also available is Type THW, is similar to Type TW but withstand a greater degree of heat, and consequently has a higher ampacity rating in the larger sizes.

Back 114

T, TW, THW

Front 115

These are comparatively new types of wire, consisting of the basic Type THH and THW but with less thermoplastic insulation, and with a final extruded jacket of nylon. Nylon has exceptional insulating qualities and great mechanical strength, all of which results in a wire which is smaller in diameter than ordinary Types T, TW, TW of corresponding size.

Back 115

B TYPES THHN, THWN

Front 116

In appearance, it resembles Types T, TW, THW but because of somewhat thinner layer of insulation, the over-all diameter is smaller. The insulation is “cross-linked synthetic polymer,” which has an extraordinary properties as to insulating value, heat resistance, and moisture resistance. It may be used in dry or wet locations. While at present, it is an expensive wire, it would be no surprise if in due course of time, this one single type will replace all the many types and subtypes of Type T or R now recognized by the Code.

Back 116

C. TYPE XHHW

Front 117

It consists of copper conductor, tinned to make it easier to remove the insulation, and for easy soldering. Over the copper is a layer of rubber, the thickness of which depends on the size of the wire. Then follows an outer fabric braid which is saturated with moisture- and- fire-resistant compounds; if it is set on fire with a blowtorch, the flame dies out when the torch is removed.

Back 117

RUBBER-COVERED WIRE

Front 118

(?) such as the basic Type (?) , which is suitable for only in dry locations, is no longer being made. The most ordinary kind is Type RHW, which may be used for dry or wet locations. Types RH and RHH have insulation which withstands more heat and therefore have a higher ampacity in the larger size. They may be used only in dry locations.

Back 118

OTHER TYPES Type R

Front 119

CAPSs

Back 119

CHAPTER, ARTICLE, PART, SECTION, Sub section

Front 120

RA 7920

Back 120

OBO, OCE, OME

Front 121

A (?) is defined as a protection device used to protect an electric circuit from damage caused by an overcurrent or short circuit

Back 121

circuit breaker

Front 122

Circuit Breaker parts

Back 122

Modified Frame

Arc Extinguisher

Operating mechanism

Contacts

Trip units

Front 123

As the name suggests, the frame protects all the internal components of the circuit breaker.

Back 123

Frame or external casing

Front 124

All types of circuit breakers use some method to disconnect the power supply. These typically include spring-loaded switches,

Back 124

Operating Mechanism

Front 125

The function of contacts is to pass the current through the circuit breaker when they are closed

Back 125

Electrical contacts

Front 126

This usually extinguishes the arc in the event of a fault. What usually happens is, that when the contacts are disconnected,

Back 126

Arc Extinguisher

Front 127

This device helps to sense abnormal current flow in the event of overcurrent/overload, short circuit, and causes the operating mechanism to open the contacts

Back 127

Trip Unit

Front 128

In the operation of every circuit breaker, the (?) is the one that must be clearlyobserved. Hence, the arcing phenomenon in circuit breakers occurs at the time of faulty cases.

Back 128

arc

Front 129

When the contacts are in the (?) position, the contact area quickly decreases, and the current density increases due to the high current. This phenomenon determines the temperature rise and the heat production sufficient for the ionization interruption medium.

Back 129

open

Front 130

The (?) acts as a conductor and receives the arc between the contacts. The arc makes a minimum resistance path for the contacts and a huge current will flow while the arc is present.

Back 130

ionized medium

Front 131

Simply put, an AC circuit breaker is a safety switch built into your home's electrical system.

Back 131

AC Circuit Breaker

Front 132

Large power transmission networks are usually controlled by high-voltage type circuit breakers. This type of circuit breaker is used with a voltage rating of more than 600 volts. These are powered by solenoids, with current sensing protective relays driven through current transformers. High-voltage AC circuit breakers are available with ratings up to 765 kV and 1200 kV breakers

Back 132

High Voltage Circuit Breaker

Front 133

A (?) is one that is suitable for circuits rated at 600 volts or less. The most commonly used low-voltage circuit breaker is a molded case circuit breaker. Low-voltage circuit breakers are commonly seen in domestic, commercial, and industrial applications.

Back 133

low voltage circuit breaker

Front 134

They are used to protect low voltage circuits 240/415V AC with a wide range of current ratings below 125V. This type of circuit breaker does not need to be replaced every time a fault occurs and can be reused. These are primarily in the household, light-industrial, and commercial applications.

Back 134

Miniature Circuit Breaker

Front 135

A DC circuit breaker protects electrical equipment operating with DC and has additional arc extinguishing measures. These are relatively new technologies for most homeowners because most appliances are used in the homework with AC current.

Back 135

Molded Case Circuit Breaker

Front 136

(?) is a switching device that interrupts the normal flow of current in the circuit. These types of circuit breakers provide a very efficient way of power transmission over very long distances and are nowadays used in various green energy generation.

Back 136

HVDC circuit breaker

Front 137

These types of circuit breakers use an insulating oil (which has better dielectric strength than air) as a dielectric medium to extinguish the arc and break the circuit safely. The moving contacts and the stationary contacts are immersed inside the insulating oil.

Back 137

Oil Circuit Breaker

Front 138

These types of circuit breakers use oil arc quenching media as well as insulating media between the current-carrying contacts and the earthing parts of the breaker. The amount of oil required in this circuit breaker depends on the system voltage.

Back 138

Bulk Oil Circuit Breaker

Front 139

uses oil as the interrupting media. This type of circuit breaker will keep the interrupting unit at the live potential in an insulating chamber. Since less amount of oil is required it is called a minimum oil circuit breaker.

Back 139

Minimum Oil Circuit Breaker

Front 140

As the name suggests, this circuit breaker operates in the air. Air circuit breakers are used for the purpose of protecting low voltage circuits, mainly for activating and cutting off the high currents.

Back 140

Air Circuit Breaker

Front 141

The Air blast circuit breaker employs a high-pressure air blast as an arc extinguishing medium. This type of circuit breaker is used in open terminal HV applications with a voltage range of 245 kV, and 400 kV up to 765 kV, especially where fast breaker operation is required.

Back 141

Air Blast Circuit Breaker

Front 142

The SF 6 circuit breaker is a type of circuit breaker that uses pressurized Sulphur Hexafluoride gas to extinguish the arc. It is a strong dielectric gas with better insulating and arc quenching properties than air or oil. It is commonly used for arc quenching in high voltage circuit breakers up to 800 kV in power stations and electrical grids

Back 142

SF 6 Circuit Breaker

Front 143

This type of circuit breaker is mostly used in high voltage electrical systems to perform a similar function to the breakers in a home electrical panel. The function of this device is to cut off power to an electrical outlet in case of a short circuit or electrical fault to allow manual disconnection of the circuit so that it can be repaired.

Back 143

Vacuum Circuit Breaker

Front 144

In electrical panels, single-pole breakers look like narrow switches. Single pole circuit breakers are used for many applications such as general lighting outlets, vacuums, fans, power tools, curling irons, outdoor lighting, radios, computers, DVD players, and air compressor

Back 144

Single Pole Circuit Breaker