hbiss
EC, Westchester, New York NEC: 2014
- Location
- Hawthorne, New York NEC: 2014
- Occupation
- EC
Mini-split A/C install
- Thread starter petersonra
- Start date
- Status
petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- engineer
200 feet max
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
You still haven't answered whether there is a crawl space, or should I figure that you wouldn't be asking if there was?
petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- engineer
There is a crawl space but it is very difficult to get at
hbiss
EC, Westchester, New York NEC: 2014
- Location
- Hawthorne, New York NEC: 2014
- Occupation
- EC
kwired
Electron manager
- Location
- NE Nebraska
Supply circuit likely needs to go some other direction or at least beyond the inside unit.
??
It has to go to the outdoor unit and then back through the second tube to the indoor unit(s), it is a closed loop system.
kwired
Electron manager
- Location
- NE Nebraska
But can it be "fished"?
I've shoved PVC pipe across crawlspaces and attics that I can't crawl through many times. Might use it just for it's rigidness and pull it back out or shove it in and use it to pull through - depends on situation.
petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- engineer
The plumbers once ran a water line that way through the crawl space. I suppose it could be done. The guy I talked to did not seem to think much of the idea though.
petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- engineer
I am not sure exactly what he had in mind but I suspect his plan was more to pull it behind the siding than to try and stuff it up there.
hbiss
EC, Westchester, New York NEC: 2014
- Location
- Hawthorne, New York NEC: 2014
- Occupation
- EC
Yeah, good luck with that. He sounds like the kind of HVAC guy that needs to stick to HVAC and stay away from electrical.
Sounds good to me. Done it plenty of times too. I don't think your HVAC guy wants to crawl in there.
-Hal
readydave8
re member
- Location
- Clarkesville, Georgia
- Occupation
- electrician
sounds like good opportunity to redo service, use meterpack with extra spaces, move indoor panel
by the way I"ll pull that wire thru the crawl space for you unless clearance is less than 12"
rnatalie
Senior Member
- Location
- Catawba, NC
- Occupation
- Retired Electrical Engineer
Both the compressor (the outside part) and the evaporator (the inside part) need power. Most you can feed the incoming power to either end and send it through to (with the freon pipes) to the other.
Note the disconnect requirements inherent in light of this.
Note the disconnect requirements inherent in light of this.
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
Yes, no, maybe.... you need to read NC interpretations. A mini split is considered one unit and therefore the outside unit gets fed and no need for a disconnect on the inside unit unless the manufacturer requires it.... This is NC interpretation-- I believe other states are going that way also.
NC Interpretations
State Electrical Code and Interpretations | OSFM
Information related to the State Electrical Code and Interpretations in North Carolina
www.ncosfm.gov
This is for the mini split
Fred B
Senior Member
- Location
- Upstate, NY
- Occupation
- Electrician
Has anyone used the new fiberglass conduit? The mfg says it has a much greater span ability between supports than PVC, shouldn't get saggy.
kwired
Electron manager
- Location
- NE Nebraska
IMO NEC alone (no other AHJ explanations needed) requires a disconnect at the outdoor unit of a minisplit - outdoor unit is an art 440 application but:Yes, no, maybe.... you need to read NC interpretations. A mini split is considered one unit and therefore the outside unit gets fed and no need for a disconnect on the inside unit unless the manufacturer requires it.... This is NC interpretation-- I believe other states are going that way also.
NC Interpretations
State Electrical Code and Interpretations | OSFM
Information related to the State Electrical Code and Interpretations in North Carolina
This is for the mini split
Indoor unit is not a 440 application - does not contain a hermetic compressor. Instead is just a motor operated appliance so we need to look at 422 for requirements. I have never seen one that is larger than 1/8 HP or 300 VA, if it would have resistance heat that would be the exception, don't think I've seen that either in a "minisplit" though. That small capacity of a unit doesn't require disconnecting means within sight of the appliance
hbiss
EC, Westchester, New York NEC: 2014
- Location
- Hawthorne, New York NEC: 2014
- Occupation
- EC
No. I've never seen a split system where you can feed power to the indoor unit. Power is provided to the outdoor condensing unit through a disconnect. Then a two or three conductor cable (UF or TC) is run from the condenser to the indoor unit along with the service lines. That cable provides power and control to the indoor unit.
-Hal
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
Agreed, especially systems with multiple room units like the one I recently fed a 30a circuit to.
hbiss
EC, Westchester, New York NEC: 2014
- Location
- Hawthorne, New York NEC: 2014
- Occupation
- EC
Yes. You can have them with 4 or more indoor units off one condensing unit.
-Hal
-Hal
James L
Senior Member
- Location
- Kansas Cty, Mo, USA
- Occupation
- Electrician
In those instances, the indoor units get powered separately from the outdoor unit
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
Not the system I just installed power to. The umbilicals include refrigerant and power lines.
- Status