On Tuesday, June 10, 2014 3:49:51 PM UTC-4, jamesgang wrote:
On Tuesday, June 10, 2014 3:22:18 PM UTC-4, wrote:

I'm helping install a mini-split AC. The manual says I need 10 gauge wire to an outdoor disconnect switch. I've two questions:







1. What does the NEC say about the min height of the disconnect switch when mounted to the wall outside? I know I need 3ft clearance in front of it, but not sure about minimum height.







2. I haven't decided which to run (MC or NM cable) from my main panel to the outdoor disconnect switch, but regardless, when it gets outside of my house, what does the NEC say about how the cable should be run? I assume in metal or plastic conduit? Any other allowable alternatives?







All advice, and NEC references, appreciated.



Thanks



Theodore



The disconnect needs to be within reach. Commonly a level similar to the top of the unit but just to one side.



What alternative did you want? The plastic conduit pigtails are available with wire in them from the big box stores ready to hookup. That's the simplest.

Agree. IDK any specific height reqt. I would put it at a convenient
height. In many cases the height is dictated by where it's convenient
for the wire to comes out
from a basement, crawlspace, etc. Typical it's Romex from panel, through
the rim joist to the disconnect. Then liquidtight from the disconnect to
the condensor. At my house that results in the disconnect being about
18" off the ground and it passed. Could have made it higher, but then
it wouldn't be a straight shot through from the basement. As JG says,
you can buy the whips in a couple std lengths, with wires in them already
at a price that's typically less than buying the conduit, wire, fittings separately.