I was reading through the language for table 314.16(B) about the 'Volume Allowance Required per Conductor'. Trying to understand and comparing with the Canadian Electrical Code, since in CEC, the language describing the table felt like it has a different understanding of the language. CEC stated as 'Usable Space Required for each Insulated Conductor'. Do you think it's the same understanding? If it differs, any thoughts and advise on how to approach? On the job that I am doing now, there are requirements to meet NEC, CEC, UL and CUL. Does NEC meant Volume that shall be used by each conductor, or is it Volume leftover for each conductor? confused and a bit frazzled.
need help understanding 314
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jumper
Senior Member
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The two sections header statements pretty much say the same thing.
Each conductor needs so much space/volume based on its size.
The amount of conductors are then totaled for a minimum sized box.
Add in devices, clamps, etc also. Note rule for EGCs.
Each conductor needs so much space/volume based on its size.
The amount of conductors are then totaled for a minimum sized box.
Add in devices, clamps, etc also. Note rule for EGCs.
kwired
Electron manager
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- NE Nebraska
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- EC
In NEC all equipment grounding conductors count as one conductor whether insulated or not, with a volume based on largest one if there are different sizes involved.
Otherwise the rest of the conductors in the box are given a volume amount (each) and total volume of conductors can not exceed the total volume of the box. A conductor that does not leave the box or is the supply lead of a luminaire that covers the box does not have to be counted either.
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