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Wire Size for heat Pump

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Wire Size for heat Pump komobu 04-04-2008
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Posted by komobu on April 4, 2008, 10:34 am
Hi;

We had a fire and are putting are building back together. I have a new
heat pump that has heat strips that draw 90 amps. A new wire has to be
run from the panel to the heater. The run is about 75 feet. The
electrical contractor is responsible by contract to hook up all wires
to the new 200 amp panel he is installing. He wants an additional 1300
to run the one wire for the heat pump. He says the wire and conduit
alone will run 1000 dollars. I am debating running this wire myself.
If I run the wire, he will attach it to the panel as part of the
original bid to hook up all wires to the new panel. So all I have to
do is put the wire in the conduit and attach it to the wall. I would
like to weigh the cost. What is the correct wire size that will be
needed for 90 amps?

Thanks
Pat

Posted by S. Barker on April 4, 2008, 11:35 am
4ga.


s

> Hi;
>
> We had a fire and are putting are building back together. I have a new
> heat pump that has heat strips that draw 90 amps. A new wire has to be
> run from the panel to the heater. The run is about 75 feet. The
> electrical contractor is responsible by contract to hook up all wires
> to the new 200 amp panel he is installing. He wants an additional 1300
> to run the one wire for the heat pump. He says the wire and conduit
> alone will run 1000 dollars. I am debating running this wire myself.
> If I run the wire, he will attach it to the panel as part of the
> original bid to hook up all wires to the new panel. So all I have to
> do is put the wire in the conduit and attach it to the wall. I would
> like to weigh the cost. What is the correct wire size that will be
> needed for 90 amps?
>
> Thanks
> Pat



Posted by on April 4, 2008, 11:57 am
Ask your electrician. Since he is doing the final hookup which is is
going to be inspected (I assume you had to get a permit), you will
want to make sure he agrees that you choose the right gauge.
Otherwise, he could refuse to hook it up.

Posted by David Nebenzahl on April 4, 2008, 2:32 pm
On 4/4/2008 7:57 AM noname87@hotmail.com spake thus:

> Ask your electrician. Since he is doing the final hookup which is is
> going to be inspected (I assume you had to get a permit), you will
> want to make sure he agrees that you choose the right gauge.
> Otherwise, he could refuse to hook it up.

Correction: he *should* refuse to hook it up.


--
The best argument against democracy is a five-minute
conversation with the average voter.

- Attributed to Winston Churchill

Posted by on April 4, 2008, 12:38 pm
wrote:

>Hi;
>
>We had a fire and are putting are building back together. I have a new
>heat pump that has heat strips that draw 90 amps. A new wire has to be
>run from the panel to the heater. The run is about 75 feet. The
>electrical contractor is responsible by contract to hook up all wires
>to the new 200 amp panel he is installing. He wants an additional 1300
>to run the one wire for the heat pump. He says the wire and conduit
>alone will run 1000 dollars. I am debating running this wire myself.
>If I run the wire, he will attach it to the panel as part of the
>original bid to hook up all wires to the new panel. So all I have to
>do is put the wire in the conduit and attach it to the wall. I would
>like to weigh the cost. What is the correct wire size that will be
>needed for 90 amps?
>
>Thanks
>Pat

What does the label say?
If the actual draw of the heat strips is 90 you also have to add the
motor and other load and the largest load has to be taken at 125%.
Usually the installation instructions /label will do all this
calculation and give you a "minimum circuit ampacity".
If that is where you got 90, the answer is 3 ga copper

Page 1 of 2       1 2 > last >>
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