travislsuttle
Member
- Location
- US
What are the clearances for a disconnect for a condensing unit outdoor
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Ac disconnect
- Thread starter travislsuttle
- Start date
- Status
- Location
- Massachusetts
Check out 110.26
travislsuttle
Member
- Location
- US
I thought since a breaker controlled the disconnect 110.26 didn't apply
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AHJ Call. Been debated some here but a vast majority feel that the disconnect is "subject to examination, adjustment, servicing or maintenance" as noted in 110.26 and thus subject to those requirements.
travislsuttle
Member
- Location
- US
AHJ is saying 30 inches I was hoping I could find some help as I don't have 30 inches on most of these units
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jumper
Senior Member
- Location
- 3 Hr 2 Min from Winged Horses
Not really applicable.
It is a question of whether your inspector considers the disco a piece of equipment likely to energized while being worked on or such.
Opinions vary.
jumper
Senior Member
- Location
- 3 Hr 2 Min from Winged Horses
No help will be found in the NEC. AHJ call.
- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
If the AHJ is invoking "likely to be worked on when energized", then the width and depth of the required space is clear cut in the NEC, with no wiggle room. And the first decision is totally up to the AHJ (who is usually not the inspector).
travislsuttle
Member
- Location
- US
Why would you work on an energized disconnect when there is a breaker controlling it. The disconnect is just a means to make the condensing unit you plan to work on not energized.
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- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
To do a hot-dead-hot check on the feed to the A/C?
jumper
Senior Member
- Location
- 3 Hr 2 Min from Winged Horses
:happyyes:
mwm1752
Senior Member
- Location
- Aspen, Colo
several ways to look at your situation -- Is the branch circuit OCPD readily accessible? yes add breakerlock no use a non fuse disconnect -- we do not gennerally require a disconnect/single pole switch/ dbl pole switch to be readily accessible for equipment -- Likely to be energize IMO comes with fuses & OCPD, a non fused disconnect will render the equipment non energized when replacing AC Unit -- the internal parts to be replaced for a fused type disconnect would render the disconnect likey to be energized when the branch circuit OCPD is not readily accessible.
- Location
- Illinois
- Occupation
- retired electrician
The load side of the local disconnect, fused or not, would be the very first place where many service techs would check for power if there was a service call. Based on that, many AHJs required 110.26 work spaces for a disconnect at a AC unit.
jumper
Senior Member
- Location
- 3 Hr 2 Min from Winged Horses
:thumbsup::thumbsup::thumbsup:
mwm1752
Senior Member
- Location
- Aspen, Colo
A service tech may open an easily accessible AC unit J box to check power on the non fused disconnect. Without a fuse or OCPD you could visibly see if the knife switch worked or was damaged. And if there is no power at the AC unit using a non fused disconnect, then the operation of servicing that disconnect is not likely to be energized. Yes many AHJ require 110.26 for non fused, pullout, knife type disconnects for AC units. Some do not. Personally, I always promote clearances during rough in.
There are many electricians out there that will check for voltage in akward positions for J boxes or non fused, pullout, knife type disconnects that are likely to be energized but in general for those types of terminations ready access is not required.
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