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-   -   New Panel Installation (http://www.diychatroom.com/f18/new-panel-installation-200506/)

bobbygravelle 05-08-2014 11:11 PM

New Panel Installation
 
Hi all

Attached to the house is a panel and attached to that is a sub panel.

What I want to do is run 3/4 PVC, 220v off the sub panel to another panel to a greenhouse. What are some things I need to be aware of/ should know?

I plan on using 10/3 wire off of a breaker on the sub panel

jbfan 05-08-2014 11:16 PM

Unless the 10/3 is uf cable, it can not be used outside.
What is the load of the greenhouse?

bobbygravelle 05-08-2014 11:21 PM

Quote:

Originally Posted by jbfan (Post 1347980)
Unless the 10/3 is uf cable, it can not be used outside.
What is the load of the greenhouse?

THHN, I am running it in PVC conduit, and lets say the load of the greenhouse is 80 amps ( which would mean I would run a 100 amp panel, correct? )

jbfan 05-08-2014 11:26 PM

Thhn is not allowed in a wet location, must be thwn.
No way you can get 80 amps on #10 wire.

The load at the greenhouse will be limited by thd feed to the first subpanel.

rjniles 05-08-2014 11:41 PM

Quote:

Originally Posted by bobbygravelle (Post 1347975)
Hi all

Attached to the house is a panel and attached to that is a sub panel.

What I want to do is run 3/4 PVC, 220v off the sub panel to another panel to a greenhouse. What are some things I need to be aware of/ should know?

I plan on using 10/3 wire off of a breaker on the sub panel

What you need to know is that based on your questions you need to hire an electrician.

bobbygravelle 05-08-2014 11:44 PM

Quote:

Originally Posted by jbfan (Post 1347986)
Thhn is not allowed in a wet location, must be thwn.
No way you can get 80 amps on #10 wire.

The load at the greenhouse will be limited by thd feed to the first subpanel.

Ok thanks,

I haven't checked the wire size feeding the sub panel, but it's a pretty big wire coming in. Let's say it's 2 gauge, which is rated at 130 amps at 90 degrees. Would I have to run this all the way to a new sub panel by the greenhouse?

jbfan 05-09-2014 07:18 AM

With out knowing ALL the details, we can what if until the cows come home!

Philly Master 05-09-2014 07:32 AM

the least expensive way would be to buy #2 Alum. you need 4 wires for a subpanel like this .... its about 1.50 a foot

http://www.homedepot.com/p/Southwire...2801/202316409


you will need 1 1/4" pipe



and FYI for all practical purposes you cannot buy just THHN wire it is all THHN/THWN or dual rated now ...

and the cost would be much higher being that its copper

bobbygravelle 05-09-2014 12:07 PM

Quote:

Originally Posted by Philly Master (Post 1348048)
the least expensive way would be to buy #2 Alum. you need 4 wires for a subpanel like this .... its about 1.50 a foot



you will need 1 1/4" pipe



and FYI for all practical purposes you cannot buy just THHN wire it is all THHN/THWN or dual rated now ...

and the cost would be much higher being that its copper

Some good answers, thank you

Jim Port 05-09-2014 12:43 PM

The wire cannot be used at its 90 degree ampacity.

sgip2000 05-09-2014 01:00 PM

First, you need to figure out what size load you will have in the greenhouse. Then based on that information, you can figure out the ampacity and wire gauge needed.

bobbygravelle 05-09-2014 07:15 PM

Quote:

Originally Posted by Philly Master (Post 1348048)
the least expensive way would be to buy #2 Alum. you need 4 wires for a subpanel like this .... its about 1.50 a foot




you will need 1 1/4" pipe



and FYI for all practical purposes you cannot buy just THHN wire it is all THHN/THWN or dual rated now ...

and the cost would be much higher being that its copper

It says that #2 aluminum wire is rated at 90 amps, and I want a 100 amp panel, will I run into problems?

rjniles 05-09-2014 07:36 PM

100 amps to a greenhouse? A grow house?

bobbygravelle 05-09-2014 07:38 PM

Quote:

Originally Posted by rjniles (Post 1348388)
100 amps to a greenhouse? A grow house?

yes why

plummen 05-09-2014 09:21 PM

How about a picture of what you have for an existing service including inside the panels, then we can atleast have a clue of what can safely be run.
Thats why I never give estimates over the phone without seeing the job first.:laughing:


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