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Old 09-24-2013, 07:44 AM   #1
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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


Last edited by focused; 09-24-2013 at 08:00 AM.
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Old 09-24-2013, 08:15 AM   #2
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Conduit fill and electric car charging


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

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Old 09-24-2013, 08:29 AM   #3
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Your electrician said it is ok, but you don't believe him, so you ask on a DIY forum!
exactly

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

Last edited by focused; 09-24-2013 at 08:36 AM.
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Old 09-24-2013, 08:38 AM   #4
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Conduit fill and electric car charging


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

Last edited by itsnotrequired; 09-24-2013 at 08:42 AM.
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Old 09-24-2013, 08:50 AM   #5
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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?
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Old 09-24-2013, 08:55 AM   #6
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Conduit fill and electric car charging


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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.
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Old 09-24-2013, 09:24 AM   #7
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Conduit fill and electric car charging


Quote:
Originally Posted by jbfan View Post
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?
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Old 09-24-2013, 09:31 AM   #8
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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
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Old 09-24-2013, 11:40 AM   #9
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Conduit fill and electric car charging


Run the damn charger with what you got. It would be silly to concern yourself with conduit fill now.
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Old 09-24-2013, 12:27 PM   #10
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Conduit fill and electric car charging


Quote:
Originally Posted by focused View Post
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!
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Old 09-24-2013, 12:29 PM   #11
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Conduit fill and electric car charging


Pull the #12 ground out. You don't need it. The #10 is good for both circuits.
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Old 09-24-2013, 12:31 PM   #12
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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?..
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Old 09-24-2013, 01:00 PM   #13
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Conduit fill and electric car charging


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!
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Old 09-24-2013, 01:05 PM   #14
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Conduit fill and electric car charging


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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.
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Old 09-24-2013, 02:25 PM   #15
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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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