pull box defined

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69jag

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tulsa, ok
I wish to pull three sets of 500mcm through a 3' x 3' junction box I was wondering if I need to ground out the box since I am only passing thru to the panel which is connected to the j-box any code articals that will allow this ?
 
69jag,article 314.4 states that all metal boxes shall be be grounded per 250. Article 250.134(B).requires you to use the EGC that was run within the raceway.If you run it you must ground it.
Rick
 
If the raceway system qualifies as the EGC under 250.118 the EGC run with the circuit conductors would not be required to terminate in the JB if the other conductors only pass through.
 
John , the way i always understood and was taught at seminars and such, is that if the EGC is put in the raceway, then it needs to be connected to any pull boxes along the way even though the metal raceways provide the path.
Rick
 
RUWired said:
John , the way i always understood and was taught at seminars and such, is that if the EGC is put in the raceway, then it needs to be connected to any pull boxes along the way even though the metal raceways provide the path.
Rick
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John is correct. If the phase conductors pass through the box unspliced than the conduit may be used as the EGC for the box. The EGC run with the phase conductors is not required to be connected to the box.


250.148 Continuity and Attachment of Equipment Grounding Conductors to Boxes.
Where circuit conductors are spliced within a box, or terminated on equipment within or supported by a box, any equipment grounding conductor(s) associated with those circuit conductors shall be spliced or joined within the box or to the box with devices suitable for the use in accordance with 250.148(A) through (E).
Exception: The equipment grounding conductor permitted in 250.146(D) shall not be required to be connected to the other equipment grounding conductors or to the box.
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Rick,
John , the way i always understood and was taught at seminars and such, is that if the EGC is put in the raceway, then it needs to be connected to any pull boxes along the way even though the metal raceways provide the path.
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The code said that in the 99 code, but no longer says that. Starting with the 02 code, the EGC is only required to be connected to the box if the circuit conductors are spliced within a box, or terminated on equipment within or supported by the box.
Don
 
RUWired said:
Don, what article allows that? The exception in 250.148 only applies to iso ground wires.
Rick
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It's not the exception but the first sentence of 250.148 "Where circuit conductors are spliced within a box, or terminated on equipment within or supported by a box". If they're not spliced than there is no requirement to connect the EGC to the box.
 
I have a hard time agreeing with your inturpetation of that article.If a loose connection at a box is made and a fault occurrs in the run , the effective ground fault path is not there unless the box is grounded,and if the run was made without an EGC and a fault occurrs, then theres big problems.I think 250.134(B) supports me.
Rick
 
Rick, as Don pointed out this is a change that happened in 2002.

If the circuit conductors do not splice or terminate withing a box you do not have to land the EGC to the box.

This of course assumes the metal pull can is already grounded through the raceway.

When you run circuit conductors through a conduit body such as an LB would you connect any EGC passing through to the LB?

Electrically this is the same thing as conductors passing through a pull box, the LB is grounded by the raceway.
 
Rick,
I have a hard time agreeing with your inturpetation of that article.
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How can you not agree? The code wording is clear.
Where circuit conductors are spliced within a box, or terminated on equipment within or supported by a box, any equipment grounding conductor(s) associated with those circuit conductors shall be spliced or joined within the box or to the box with devices suitable for the use in accordance with 250.148(A) through (E).
Click to expand...
250.134(B) is satisified by the metal raceway.
Don
 
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