NEC Commercial Electrical Practice Test

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

From $25.99Unlock all

1 / 20

A metal underground water pipe used as a grounding electrode must be in direct contact with the earth for at least how many feet?

?

10 feet

Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy