Wire Derating In Steel Channell

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Robert Maddox

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Location
Jonesboro, Ga.
When running multiple circuits with individual neutrals in metal steel channells (i.e.- Unistrut, etc) does the same conductor derating tables apply as for the conductor is steel conduits?

I appreciate your input.
 
jumper

jumper

Senior Member
Location
3 Hr 2 Min from Winged Horses
How is uni strut listed as a raceway?

Raceway. An enclosed channel of metal or nonmetallic
materials designed expressly for holding wires, cables, or
busbars, with additional functions as permitted in this
Code. Raceways include, but are not limited to, rigid metal
conduit, rigid nonmetallic conduit, intermediate metal conduit,
liquid tight flexible conduit, flexible metallic tubing,
flexible metal conduit, electrical nonmetallic tubing,
electrical metallic tubing, underfloor raceways, cellular concrete floor raceways, cellular metal floor raceways,
surface raceways, wireways, and busways.
 
infinity

infinity

Moderator
Staff member
Location
New Jersey
Occupation
Journeyman Electrician
Strut-Type Channel Raceways are covered under Article 384. Derating might not apply if you can comply with 384.22.
 
jumper

jumper

Senior Member
Location
3 Hr 2 Min from Winged Horses
infinity said:
Strut-Type Channel Raceways are covered under Article 384. Derating might not apply if you can comply with 384.22.
Click to expand...
Aw crapola!

384.22 Number of Conductors. The number of conductors
permitted in strut-type channel raceways shall not exceed
the percentage fill using Table 384.22 and applicable
cross-sectional area of specific types and sizes of wire
given in the tables in Chapter 9.
The derating factors of 310.15(B)(2)(a) shall not apply
to conductors installed in strut-type channel raceways
where all of the following conditions are met:
 
iwire

iwire

Moderator
Staff member
Location
Massachusetts
jumper said:
I will down load it later, I am busy looking for salt to put on my crow.:)
Click to expand...

:grin:

How would you know that if you had not seen it? :)

I know about it because I happened to have worked with it as a raceway a few times. If you have to run a bunch of strut to hold lighting fixtures it really saves a step running conduits to the lights as well.

You get strut without slots and buy covers that snap on the open side to make it a complete raceway.
 
jumper

jumper

Senior Member
Location
3 Hr 2 Min from Winged Horses
iwire said:
:grin:

How would you know that if you had not seen it? :)

I know about it because I happened to have worked with it as a raceway a few times. If you have to run a bunch of strut to hold lighting fixtures it really saves a step running conduits to the lights as well.

You get strut without slots and buy covers that snap on the open side to make it a complete raceway.
Click to expand...


Thank you. Learning is tough at times. I appreciate it.
 
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