Ramfan4life83@gmail.com
New User
- Location
- Las Vegas, Nevada
I could swear that I read somewhere that if the cross sectional area of a raceway is 4" or larger you do not need to derate for ampacity, but I can't find where. Can anyone help?
Derating question
- Thread starter Ramfan4life83@gmail.com
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- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
Never heard of that. The pipe can be huge however the conductors will still be laying atop of each other on horizontal runs so derating must apply
ggunn
PE (Electrical), NABCEP certified
- Location
- Austin, TX, USA
- Occupation
- Consulting Electrical Engineer - Photovoltaic Systems
You may be thinking of gutters. They have different derating rules.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
No such rule, install 4-#14 CCC's in a 4" conduit and derating still required.
When you remember who told you that find them and slap em.
A heating element will heat any size oven, the larger ones just take longer.
Roger
- Location
- New Jersey
- Occupation
- Journeyman Electrician
I've always felt that this was kind of bogus, after all I can put 30-#12 CCC's in a 2X2 wireway (cross sectional area of 4" sq inches) without derating but I cannot put more than 3-12 CCC's in a 4" EMT (cross sectional area of 18.75 sq inches) without derating. :roll:
In my mind the only justification I came up with is that tubular raceways tend to be used in longer lengths than wireways but that really shouldn't matter.
In my mind the only justification I came up with is that tubular raceways tend to be used in longer lengths than wireways but that really shouldn't matter.
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