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21 Cards in this Set
- Front
- Back
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When _ a hoist to a structure, make sure the structure is strong enough. |
Attaching |
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When a 3 phase, 4w supply delivers 120/240 volts, the system has B-phase-to-neutral voltages that are ___ volts. |
208v |
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What formula is required to find the line current of a single phase system? |
Line current = P (single phase) / line voltage. |
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What formula is required to find the line current of a 3 phase system? |
Line current = 3phase power / (line voltage x 1.732) |
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Another name for "rated power output"? |
Capacity |
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The rated power output can be delivered by a generator is given on the nameplate in ___ or ___. |
Watts or KW |
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Another formula to find line current of a 3phase system is ____? |
Line current = (3phase power / line voltage) / 1.732. |
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An examples of a "straight voltage rating" are ___ and ___? |
2400v 3phase 3-w...... Or...... 480v 3phase 4-w |
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Straight voltage rated systems are typically Wye or Delta setup? |
Delta |
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A voltage system that has 2 voltage outputs are referred to as___? |
Slash voltage rating. |
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An example of a Slash voltage rated system is? |
120/280v 3ph 4-w |
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120/240v system is Wye or Delta configuration? Why? |
Delta, because 240 / 2 = 120 |
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120/208v system is Wye or Delta configuration? Why? |
Wye configuration. Because 120 x 1.732 = 208. |
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What is the other common type of transformer configuration? And Which is typically the Primary, and which is the secondary? |
Delta (primary) - Wye (secondary). |
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In a 480/277v 3ph 4w panel, what is the current in circuit 1, with a 2.1 KVA load? |
2100va / 277v = 7.58a |
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In a 480/277v 3ph 4w panel, what is the current in circuit 2 (on a 2 pole breaker), with a 7.9 KVA load? |
7900va / 480v = 16.46 amps |
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In a 480/277v 3ph 4w panel, what is the current in circuit 6 (on a 3 pole breaker), with a 41.3KW load? |
(41300va / 480v) / 1.732 = 49.6 amps |
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In a 3ph 4w system, which phase is circuit 1 typically on? Which phase is circuit 2 typically on? |
A. Also A |
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In a 3ph 4w system, which phase is circuit 5 typically on? Which phase is circuit 3 typically on? |
C phase. B phase. |
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Match up the windings |
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Is this a delta or Wye configuration? |
Delta |
