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-   -   Conduit fill and electric car charging (http://www.diychatroom.com/f18/conduit-fill-electric-car-charging-187549/)

focused 09-24-2013 07:44 AM

Conduit fill and electric car charging
 
I have a 1/2" emt conduit running to my garage. It has 3 #12 wires (hot, neutral, ground) running to the a 110v outlet powering the garage opener, an overhead light, and a refrigerator. The conduit also has 2 #8 (L1 and L2) wires and a #10 (ground) running to a 240v outlet. All wires and conduit are in good shape.

I'm having an electric car charger installed and the electrician says it will be fine to use the 240v line that is already there. The charger pulls 30amps (max) and will usually run for an hour, but may run up to a max of 3.5 hours if the car is fully discharged.

I'm wondering if there is any risk in the conduit being slightly overfilled (as per NEC) in this setup?

Thanks

jbfan 09-24-2013 08:15 AM

Your electrician said it is ok, but you don't believe him, so you ask on a DIY forum!

focused 09-24-2013 08:29 AM

Quote:

Originally Posted by jbfan (Post 1245864)
Your electrician said it is ok, but you don't believe him, so you ask on a DIY forum!

exactly :yes:

and since you are an electrical contractor, I'd love to hear your opinion...

itsnotrequired 09-24-2013 08:38 AM

what type of conductor is in the conduit? if all insulated thhn, the conduit is overfilled

focused 09-24-2013 08:50 AM

Quote:

Originally Posted by itsnotrequired (Post 1245874)
what type of conductor is in the conduit? if all insulated thhn, the conduit is overfilled

yes all thhn

yes is overfilled. it is barely overfilled, but overfilled nonetheless. this is where my concern rests...

is this a problem?

itsnotrequired 09-24-2013 08:55 AM

Quote:

Originally Posted by focused (Post 1245881)
yes all thhn

yes is overfilled. it is barely overfilled, but overfilled nonetheless. this is where my concern rests...

is this a problem?

it is a 'problem' in that it is a code violation but from a practical standpoint, it is probably fine. your electrician doesn't seem to think it is an issue.

wkearney99 09-24-2013 09:24 AM

Quote:

Originally Posted by jbfan (Post 1245864)
Your electrician said it is ok, but you don't believe him, so you ask on a DIY forum!

Yes, because of course all contractors do the right thing... The man's just looking for a heads-up, that's not an unreasonable thing to ask here.

The next question is how much of a pain in the butt (as in, how expensive) would it be to install a new conduit?

That and what's intended to run off that other 240v outlet?

focused 09-24-2013 09:31 AM

Quote:

Originally Posted by wkearney99 (Post 1245895)
Yes, because of course all contractors do the right thing... The man's just looking for a heads-up, that's not an unreasonable thing to ask here.

The next question is how much of a pain in the butt (as in, how expensive) would it be to install a new conduit?

That and what's intended to run off that other 240v outlet?

To install a whole new conduit and circuit would be over $1100, which I would really love to avoid of course

A car charger will run off of the circuit - see original post for specifics

J. V. 09-24-2013 11:40 AM

Run the damn charger with what you got. It would be silly to concern yourself with conduit fill now.

rossfingal 09-24-2013 12:27 PM

Quote:

Originally Posted by focused (Post 1245881)
yes all thhn

yes is overfilled. it is barely overfilled, but overfilled nonetheless. this is where my concern rests...

is this a problem?

A problem?!?
Hmmm??
Could be a heat issue!?!
It must have been fun pulling those wires through a 1/2 inch conduit!
Sure hope there aren't any "nicks"!
How long is the run?
How many bends?
Just some thoughts!

joed 09-24-2013 12:29 PM

Pull the #12 ground out. You don't need it. The #10 is good for both circuits.

focused 09-24-2013 12:31 PM

Quote:

Originally Posted by rossfingal (Post 1245948)
A problem?!?
Hmmm??
Could be a heat issue!?!
It must have been fun pulling those wires through a 1/2 inch conduit!
Sure hope there aren't any "nicks"!
How long is the run?
How many bends?
Just some thoughts!

The wires look good and there is actually still room, doesn't seem too tight...

The whole run is about 60 feet, there are 4 or 5 bends

Heat is the primary concern, but 30 amps running on #8s shouldn't be too bad I'm hoping?..

rossfingal 09-24-2013 01:00 PM

Have you pulled all the wires out and looked at them?
Maybe, follow "joed"s suggestion.
We would run 1/2 inch for the #12's and a 3/4 inch for the #8's and #10.
4 or 5 bends? - 60 feet -
we would probably run all #10's.
Just my humble opinion!
Consider what "joed" said!
(We make suggestions - we don't "engineer") :)

itsnotrequired 09-24-2013 01:05 PM

Quote:

Originally Posted by focused (Post 1245952)
The wires look good and there is actually still room, doesn't seem too tight...

The whole run is about 60 feet, there are 4 or 5 bends

Heat is the primary concern, but 30 amps running on #8s shouldn't be too bad I'm hoping?..

unless you have reason to believe the conductors were damaged during pulling, i would just leave the whole thing as is. heating shouldn't be a concern, assuming the conduit isn't routed through an attic or similar location with high ambient air temp.

focused 09-24-2013 02:25 PM

Quote:

Originally Posted by joed (Post 1245949)
Pull the #12 ground out. You don't need it. The #10 is good for both circuits.

I thought you couldn't share a ground between a 110v and a 220-240v

I could be wrong of course


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