18 thhn

kimrichi

Member
how many 18 thhn wire can we pull through 3/8 trade size flexible metal conduit
i did not find the answer hopefully somebody would
 

Dennis Alwon

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Staff member
Location
Chapel Hill, NC
Occupation
Electrical Contractor
Are you sure it is thhn. Art. 402 does not list it for thhn and I don't see #18 thhn anywhere else. I would call the manufacturer and get the area of the wire.

It looks like TFFN may be equivalent
 
Last edited:

roger

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Location
Fl
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Electrician
I think it may be a trick question, the smallest THHN I am aware of is #14. When I use smaller single conductors I usually use TFFN

Roger
 

roger

Moderator
Staff member
Location
Fl
Occupation
Electrician
Whoa, that took a long time to post, (I had a phone call) Dennis already had the answer.

Roger
 

infinity

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Staff member
Location
New Jersey
Occupation
Journeyman Electrician
I think it may be a trick question, the smallest THHN I am aware of is #14. When I use smaller single conductors I usually use TFFN

Roger
I agree it looks that way. T402.3 lists all of the fixture wires and there is no #18 THHN. 310.104(A) says THHN starts at size #14.
 
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