312.8 wiring space in switch ond OCPD enclosures

Jpflex

Jpflex

Electrician big leagues
Location
Victorville
Occupation
Electrician commercial and residential
This code has always been confusing on how to apply its rule

Apparently an enclosure such as a breaker panel (although appears not aesthetically pleasing neets code) is allowed to have splices made in it

Conductors in the cabinet are allowed to fill 40% of the space containg it

However add a splice here and all of a sudden you can fill 75%
 
Is that a question or are you just making an observation? For what it's worth you even if you tried you could not exceed 75% fill with splices in a panel.
 
I would say the 75% vs the 40% is to allow for splicing devices.
Normally the splice is just a small portion of the overall gutter so the 75% creates no problem whereas a 75% overall gutter fill could be problematic
 
I'm surprised it allows feed thru conductors from another source in a panel. I saw a 40 circuit and space panel with 50-60 circuits in a new installation and mentioned it to the electrcian and he said he was installing a subpanel and splicing them thru. He had no knowledge of NEC and I ignorantly said you couldn't use the panel as a feedthru or splice box but then went to my truck for... . Apparently you can
 
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