Ignoramus29948 ) said...

Would it be legal and possible to use 3/4" conduit to carry two 4 ga
conductors (hots) and one 6 ga conductor (neutral).

It is the type of insulation that matters in addition to the gauge of the
wire. Basically, if pulling more than one wire/cable through conduit, you
are only supposed to fill it to 40% of its cross-section diameter. Knowing
the sum of the cross-section diameters of the wire being pulled allows you
to see if you are within the 40% maximum.

In this case, using T90-Nylon (THHN) conductors will fill a 3/4" conduit
to 41.7%, so you really need to go with 1", though you could probably get
away with 3/4" but pulling will be a bit more work than it should. These
conductors only fill a 1" to 25.7%.

I have a Condiut Calculator available for free at:
http://daxack.ca/Conduit/index.html

--
Calvin Henry-Cotnam
"I really think Canada should get over to Iraq as quickly as possible"
- Paul Martin - April 30, 2003
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