Box Ground Tail

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According to 210.19(a)4 the circuit conductors can be 14 awg on 20 amp circuit, so why does equipment ground need to be larger than circuit conductor? tail is a bonding jumper 250.146 not installed along with circuit conductors in conduit
 
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EEC said:
According to 210.19(a)4 the circuit conductors can be 14 awg on 20 amp circuit, so why does equipment ground need to be larger than circuit conductor? tail is a bonding jumper 250.146 not installed along with circuit conductors in conduit
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I was thinking that the circuit was supplied with a 20 amp conductor. I would agree that if the circuit supply were #14, say to an AC unit on a 20 amp CB, than the jumper could be size #14 also.
 
210.19(A)(4) Ex 1(c)

(c) Individual outlets, other than receptacle outlets, with taps not over 450 mm (18 in.) long.
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Roger
 
Here's an illustration to accompany the post above.

210-19dx1c.gif


Roger
 
EEC said:
I am saying it is 20 amp circuit conductors on a multioulet cicuit. Each recapt. load is 180VA
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A 20 amp circuit with multiple receptacles would require sizing according to 250.122. The question is where is this specifically addressed in the article 250. If you look at 250.146 it mentions "equipment bonding jumpers", if these are meant to be the same as the "equipment grounding conductors" in table 250.122 than there is no problem.

You present an interesting question because it doesn't seem to specify that an EBJ in 250.146 is required to be sized according to 250.122. Logically the EGC and the EBJ would have to be the same size. If you had a PVC box with a non metallic raceway then the EGC would be sized to 250.122 and terminated on the device. If you're not permitted to install a smaller EGC for that scenario than I don't see how you use a smaller EBJ when bonding to a metal box since they both will perform an identical function.
 
infinity said:
Logically the EGC and the EBJ would have to be the same size. If you had a PVC box with a non metallic raceway then the EGC would be sized to 250.122 and terminated on the device. If you're not permitted to install a smaller EGC for that scenario than I don't see how you use a smaller EBJ when bonding to a metal box since they both will perform an identical function.
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Semantics aside, while a receptacle-to-box connection could be called an EBJ as far as the device itself is concerned, it is definitely the EGC for the equipment supplied by the receptacle.
 
LarryFine said:
Semantics aside, while a receptacle-to-box connection could be called an EBJ as far as the device itself is concerned, it is definitely the EGC for the equipment supplied by the receptacle.
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Those are my feelings too. However the NEC does use both terms.
 
Pierre C Belarge said:
The size of the EBJ/EGC is referenced in 250.122.
250.146 is not for sizing the conductor
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Does 250.122 say the words Equipment Bonding Jumper as mentioned in 250.146?
 
Pierre C Belarge said:
Equipment Bonding Jumpers and Equipment Grounding Conductors perform the same task, and are generally sized the same on the load side of the service disconnect, that is why I used EGC/EBJ in my prior post.
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I complete agree with you but I can't find the wording in the text of the article 250 to say this. IMO 250.146 should reference 250.122 directly to avoid any confusion.
 
infinity said:
I complete agree with you but I can't find the wording in the text of the article 250 to say this. IMO 250.146 should reference 250.122 directly to avoid any confusion.
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Is 250.102(D) what you're looking for?
 
Not to get off topic...but...If this is a receptacle circuit, what about 240.4(D)?
How do you justify the #14 wire on a 20A breaker?
Did I miss something?
steve
 
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