Box fill

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deschene00 said:
On a ISO circuit do you count the ISO ground and the ground separate or would they be considered as together for box fill?
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I think you have to count it as as another conductor for box fill.

314.16(5) Equipment Grounding Conductor Fill. Where one
or more equipment grounding conductors or equipment
bonding jumpers enter a box, a single volume allowance
in accordance with Table 314.16(B) shall be made based
on the largest equipment grounding conductor or equipment bonding jumper present in the box. Where an additional
set of equipment grounding conductors, as permitted by
250.146(D), is present in the box, an additional volume allowance
shall be made based on the largest equipment grounding
conductor in the additional set.

250.146(D) Isolated Receptacles. Where installed for the reduction
of electrical noise (electromagnetic interference) on the
grounding circuit, a receptacle in which the grounding terminal
is purposely insulated from the receptacle mounting
means shall be permitted. The receptacle grounding terminal
shall be connected to an insulated equipment grounding
conductor run with the circuit conductors. This equipment
grounding conductor shall be permitted to pass through one
or more panelboards without a connection to the panelboard
grounding terminal bar as permitted in 408.40, Exception,
so as to terminate within the same building or
structure directly at an equipment grounding conductor terminal
of the applicable derived system or service. Where
installed in accordance with the provisions of this section,
this equipment grounding conductor shall also be permitted
to pass through boxes, wireways, or other enclosures without
being connected to such enclosures.
 
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