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Massachusetts Electrician Practice 10

Practice 10 for Electrician Exam learners in Massachusetts: 25 questions, explained answers, and a review routine.

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Question 1

1

A 250 kcmil copper service requires a grounding electrode conductor (to a non-rod, non-Ufer electrode) of:

Question 2

2

A separately derived system (480-208/120 V transformer) has 4/0 copper secondary phase conductors. The system bonding jumper from Table 250.66 is:

Question 3

3

Exposed structural metal building frame likely to become energized must be:

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