Can I use both rigid and flexible conduit for a conduit run between my main
panel and sub panel?
Also, for running 220V between, what size conduit do I need for #6 or for #4
wire? As I understand the tables, 1" is sufficient for #6 and 1 1/4 for #4.
Yes you can use both rigid and flex. Transition between with adaptor
or a box if changing direction.
As for size, depends on type of wire. For THHN (commonly available in
my area) 3/4" is big enough for 4 #6, 1" is big enough for 4 #4.
Are you sure you have to use conduit? Sheathed cable of this size can
be run exposed in most common situations in residential work.
(usual disclaimer about checking local codes, etc.)
Restrictions on flex conduit are it has limited grounding conductor
ampacity, so don't use it as a ground wire and run a ground wire inside the
conduit instead. Another restriction is that flex cannot be installed where
subject to physical damage. Cable has this same restriction, so usually flex
conduit and cable can be used in the same places in a residence.
This is Turtle.
Yes you can use flex and regid conduit in combination but do use approved
Now to the conduit verses the number of wires and the size that will be
allowed to put in the conduit. Here is per say from the the NEC code on
Conduit verses size and number of wires allowed by the NEC code.
[2 -- # 6 wires] and [1 -- # 8 ground wire] in 1" conduit.
[3 --- # 6 wires] in 1" conduit.
[2 --- # 4 wires] and [1 -- #6 Ground wire] in 1 1/4" conduit.
[3 -- # 4 wires] in 1 1/4" conduit.
If you would like , e-mail me your breaker and load rating of what your
running to and i can check it out to make sure your doing good on the
conduit and wires of the job requires and not read about it in the Newspaper
about what went wrong. If your using #4 and #6 your running some heavy
equipment or load of some kind here.
Others have replied on the minimum size for your conduit, and such. May I
suggest that you consider going one or two sizes over the minium? Bigger
conduit makes pulling wire easier, especially if you have a long run, or
lots of bends. And also be aware that after 360 degrees of bends, you need
some relief, like pull elbow. If you are running with PVC conduit, or if
you use flex, you will need to run a ground wire in your conduit along with
your hots and neutral. What is the size of the breaker that you will be
protecting your sub panel with?
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