Quiz on the Code

Grounding & Bonding

1. The connection of the grounding electrode conductor connection shall be made in the service disconnecting means.

(a) true
(b) false

2. To size parallel service entrance grounded conductors for an installation in multiple raceways, a full size grounded conductor is required to be installed in each raceway.

(a) true
(b) false 

3. As a general rule, a grounded conductor shall not be used to ground non-current carrying metal parts on the load side of the service disconnecting means.

(a) true
(b) false   

4. It is allowed to ground a phase conductor to ground an electrical system.

(a) true
(b) false

5. What minimum size copper grounding electrode conductor connected to a concrete encased electrode, required for a 400 amp 120/240 volt residential service?

(a) AWG 1/0 copper 
(b) AWG #4  
(c) AWG #6
(d) AWG #8

6. Since a separately derived system is not a service, it is generally permitted to ground the neutral at multiple locations on the load side of the separately derived system.

(a) true
(b) false  

Answers:
1. (b) Ref: 250.24(A)(1)-(A)(5)
2. (b) Ref: Each raceway based on conductors in the raceway 250.24(C)(2)
3. (a) Ref: 250.24(A)(5)
4. (a) Ref: Corner Ground Delta
5. (b) Ref: 250.66(B)
6. (b) Ref: 250.30(A)(1)