EC&M Monthly Quiz May/June 2023: Grounding and Bonding Connections

In the March issue of EC&M, we published “How To Make Proper Grounding and Bonding Connections” (https://ecmweb.com/21260963) by Randy Barnett, Electrical Codes Program Manager for NTT Training. Grounding and bonding has always been a hot topic for EC&M readers — and for good reason. The National Electrical Code (NEC) lists specific methods to make grounding and bonding connections in Sec. 250.8. Failure to install these connections properly can result in shock, fire, or power quality problems. With that in mind, it’s the perfect time to test your knowledge on how to make proper grounding and bonding connections with this five-question EC&M Member’s Only quiz. After taking the quiz, enter for a chance to win a $25 gift card to Amazon, iTunes, or Cabela’s. Note: You don’t have to get all the answers correct to win.

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1.How many methods to make grounding and bonding connections does the National Electrical Code (NEC) list in Sec. 250.8?

A) 2

B) 4

C) 6

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2. Listed pressure connectors are evaluated according to one of three UL 486 standards. Which standard applies to splicing wire connectors?

A) UL 486A

B) UL 486B

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D) UL 486D

3. Terminal bars are often provided by equipment manufacturers to allow the connection of multiple conductors at one convenient location. Unless otherwise noted in the instructions, how many conductors are allowed per terminal?

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B) 2

C) 3

D) 4

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4. Section 250.53(A)(2) of the NEC provides an exception for supplemental grounding electrode requirements. What is the exception?

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B) If more than one rod, pipe, or plate grounding electrode has a resistance to earth of 25 ohms or less, the supplemental electrode shall not be required.

C) If a single rod, pipe, or plate grounding electrode has a resistance to earth of 25 ohms or less, the supplemental electrode shall be required.

D) If a single rod, pipe, or plate grounding electrode has a resistance to earth of 50 ohms or less, the supplemental electrode shall be required.

5. Which Table is for sizing the grounding electrode conductor for alternating-current systems?

A) Table 250.122

B) Table 250.102(C)(1)

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D) Table 250.8

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