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Old 05-17-2011, 01:19 PM   #1
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my first post. need help with central ac wiring


Hi everyone. I'm getting ready to have a new central acsystem installed and I decided to save some money and pull the wiring to my panel myself. I need two 220v 30amp lines pulled. One to the outside carrier condenser and another pulled to the attic for the air handler. I also need a 115v 20amp line pulled to a seperate split mini system down the length of the hide. I plan going from the panel in my basement through the wall to the outside where the AC unit is as well as up the side of the house to the attic. The 115v line will also come out of the house in the same area and travelling Dow the length of the house 50 feet in conduit. My question is can I put all 3 wire pulls together in conduit through the wall and then pull each line seperately to their location or do I have to have 3 holes in the house to keep the wires separated? If I can have them together what parts do need? LB fitting? Junction box? What size PVC conduit? Help would be very much appreciated

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Old 05-17-2011, 01:38 PM   #2
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my first post. need help with central ac wiring


If you use conduit for the complete run, you can not use Romex. You can run romex to the junction point, then from there on the other end in the attic, I would use armored cable from the junction to the shutoff switch. Check with your local AHJ and find out what they require.

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Old 05-17-2011, 01:46 PM   #3
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my first post. need help with central ac wiring


Thanks for the reply. I'm not sure I understand. Can you lay it for me like this." 10/3 from panel to outside box" from outside box to the attic through conduit to a box. From attic box to unit with Romex..... does that make sense. Also can you answer my question about how many 220 pulls can be in a single conduit. Thanks again
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Old 05-17-2011, 03:53 PM   #4
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my first post. need help with central ac wiring


It all depends on your local jurisdiction. If going to the Attic, I would use Conduit, then Armored cable to keep critters from chewing on the wiring. Check with City hall what needs to be in order such as Permits before this work is started.
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Old 05-17-2011, 04:45 PM   #5
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I have 3 quotes so far all from licenced electrician. Some are large companies and some local small businesses. They range from $800 up to $2400 to run 1 line 10 feet another line 30 feet and a 3rd line 50 feet.
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Old 05-17-2011, 05:08 PM   #6
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How much is the permit from city hall? Find out if that is in the mix. Most of the cost is labor. It cost me $190 to replace a main valve shut off for my house, which was $15 for call, and the rest labor. Part I had bought out of my pocket. That tells you why stuff is expensive. $2400 is way too much, $800 is way too small. Always get min. three bids, maybe six at the most, throw out lowest & highest bids, look at the middle. Also look in the detail estimate, what are they doing (pulling permits, cleaning up, fixing damage on structure, etc.).

I am able to pull my own electric as a homeowner where I live, and do not need a permit because of that. Worst case is that you do this stuff with planning, that even means if you have to draw it out on paper, or walk through the process, so you see it in your mind before attaching the project, do so. Unless there has been a unit in the attic, let the installer pull it, but find out first where they want the drops located, so all they have to do is the finish work if you still want to help out.
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Old 05-17-2011, 09:19 PM   #7
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#6wire from panel to airhandler with 60 amp breaker if running 15 kw heat strips,# 10/3 wire from panel with 30 amp breaker at panel running to a/c condensor with pullout non fuse box, or 30 amp breaker box also you will need a/c whip from there to your unit, as for other wire your running it depends on what amps are required for the system, 20 amps requires #12 wire

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