NM CID ES-3 Practice Questions - New Mexico CID ES-3 Low Voltage Special Systems (Under 50 Volts) Examination Exam - NM CID ES-3 Practice Questions - New Mexico CID ES-3 Low Voltage Special Systems (Under 50 Volts) Examination Exam

Question 1

Per NEC 2020 250.20(A), when must an alternating-current system of less than 50 volts be grounded?

Only when the Authority Having Jurisdiction writes a special condition Whenever the secondary current can exceed 8 amperes When supplied by a transformer whose primary exceeds 150 volts to ground, when the transformer supply is ungrounded, or when installed outdoors as overhead conductors Never; systems under 50 volts are exempt from Article 250

Correct Answer:

When supplied by a transformer whose primary exceeds 150 volts to ground, when the transformer supply is ungrounded, or when installed outdoors as overhead conductors

Question 2

What is the minimum size of the copper bonding conductor or grounding electrode conductor for a communications primary protector under NEC 2020 800.100?

16 AWG copper 18 AWG copper 14 AWG copper 6 AWG copper

Correct Answer:

14 AWG copper

Question 3

In a one- or two-family dwelling, NEC 2020 800.100 limits the primary-protector bonding conductor or grounding electrode conductor to a maximum length of:

6 feet 10 feet 20 feet 50 feet

Correct Answer:

20 feet

Question 4

Where an intersystem bonding termination required by NEC 250.94 is present, the preferred connection for a communications primary-protector bonding conductor is:

The intersystem bonding termination at the service equipment A driven rod that is intentionally isolated from the power grounding-electrode system A cold-water hose bibb on the far side of the building The nearest metallic sprinkler main, without bonding to the electrical service

Correct Answer:

The intersystem bonding termination at the service equipment

Question 5

If a separate communications grounding electrode is installed because the protector bonding conductor would exceed the dwelling length limit, how must that electrode be connected to the power grounding-electrode system?

Bond the two electrode systems together with a copper bonding jumper not smaller than 6 AWG No connection is required if the rod measures 25 ohms or less Connect them only through the equipment grounding conductor of a nearby receptacle Keep them isolated so lightning current cannot enter the service

Correct Answer:

Bond the two electrode systems together with a copper bonding jumper not smaller than 6 AWG

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About this Exam

Prepare with the NM CID ES-3 Practice Questions - New Mexico CID ES-3 Low Voltage Special Systems (Under 50 Volts) Examination Exam practice quiz. This question bank includes 100 questions covering class, cable, volt, circuit, and power. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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NM CID ES-3 Practice Questions - New Mexico CID ES-3 Low Voltage Special Systems (Under 50 Volts) Examination Exam

This practice set contains 100 questions from the matching question bank and focuses on class, cable, volt, circuit, and power. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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NM CID ES-3 Practice Questions - New Mexico CID ES-3 Low Voltage Special Systems (Under 50 Volts) Examination Exam

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