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17 Cards in this Set
- Front
- Back
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Two types of fuses |
Time delay and non time delay Aka dual element and single element |
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Two types of breakers |
Magnetic and time-limiting Aka instantaneous and thermo magnetic |
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4 disconnecting means |
Breaker Fused disconnect Manual motor starter Cord end |
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Power relays usually have a horse power of what rating |
2 |
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Low-voltage lighting relays utilize a what mechanism to return power to the lights after a blackout |
Latching |
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Lighting relays have class 3 blank voltage circuit |
Extra low |
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Contactors compared to relays can handle |
More current |
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Which has larger load capability IEC OR NEMA |
Nema |
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Which contactors have a larger creepage path? NEMA OR IEC |
NEMA |
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Four main pieces of the nameplate data on a contact or are |
Current Voltage Frequency Horse power rating |
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What does the coil provide and do |
Provides a magnetic field to pull in the Armature |
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Name the two springs and state the purpose in an Contactor |
Contact spring reduces arcing and bouncing
Armature spring bushes open Armature when not enough emf |
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Bridge contacts provide for great features |
Arcing at tips Wiping action Good seating Split the arc |
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Motor starter has two main components |
Contactors and over load relay |
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Factors that affect the heating of the motor are |
Duration of the overload Cooling of the motor Duty cycle Ambient temps |
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Two types of interconnection diagrams are |
Pin out and termination schedule |
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When selecting a disconnect U must consider criteria which are |
Current rating Voltage rating Horse power rating Manual Lockable |
