PM3 Electrical

Please complete this section if you work in a Division other than Low Voltage

SKIP the section if you work in Low Voltage.

This section of the assessment asks you to respond to multiple choice, and short answer questions. 

Please read and respond to each statement or question by selecting the best response(s), or typing in the answer to the best of your ability.

Questions may be completed in any order; all questions must be answered. 

 

PM3 Electrical

What is the approximate maximum rated secondary current of a 500KVA 25KV Delta to 347/600V Wye transformer?

  • a) 481 A
  • b) 833 A
  • c) 1019 A
  • d) 1440 A

A unit substation transformer has a rated secondary current of 2100A without a fan kit. It has an option to add a fan kit. What would be the rating of the secondary current if a fan kit was added?

  • a) 2800A
  • b) 2900A
  • c) 3000A
  • d) 3100A

What is the approximate maximum rated secondary current of a 750KVA 25KV Delta to 347/600V Wye transformer?

  • a) 2161 A
  • b) 1528 A
  • c) 1250 A
  • d) 722 A

A unit substation transformer has a rated secondary current of 1500A without a fan kit. It has an option to add a fan kit. What would be the rating of the secondary current if a fan kit was added.

  • a) 1700A
  • b) 1800A
  • c) 1900A
  • d) 2000A

What is the approximate maximum rated secondary current of a 1200KVA 25KV Delta to 347/600V Wye transformer?

  • a) 1165 A
  • b) 3458 A
  • c) 2445 A
  • d) 2000 A

Let's say you have a standard 400A 120/208V branch panel, and it’s fed from a 400A 3P breaker 30m away.

 Referring to Table 2 from the CEC (below) which size of wire should be selected for the feeder for a single run, and which size of wire from the table below should be selected for the feeder for a parallel run?

  • a) Size 500 for the single run feeder, and size 000 (3/0) for the parallel run
  • b) Size 600 for the single run feeder, and size 000 (3/0) for the parallel run
  • c) Size 400 for the single run feeder, and size 000 (2/0) for the parallel run
  • d) Size 500 for the single run feeder, and size 000 (2/0) for the parallel run

At what distance would you start considering voltage drop for a 3ph 347/600V panel feeder (copper in EMT)?

  • a) 100ft (30.5m)
  • b) 300ft (91.5m)
  • c) 600ft (183m)
  • d) 1000ft (304m)

At what distance would you start considering voltage drop for a 3ph 120/208V panel feeder (copper in EMT)?

  • a) 75ft (23m)
  • b) 125ft (38m)
  • c) 200ft (61m)
  • d) 350ft (107m)

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