If my central air compressor is sitting beneath my service panel (less than
six feet) does the code allow the breaker in the service panel itself to
serve as the AC disconnect?
If I'm reading the NEC correctly, section 440.14 all that's required is that
it be in sight of the unit.
R. Tarin
Yes you can use a breaker for the AC. However, it also seems that you do not
have the minimum room
required around your panel. 3' clearance in front and 30" to the side.
If my central air compressor is sitting beneath my service panel (less than
six feet) does the code allow the breaker in the service panel itself to
serve as the AC disconnect?
If I'm reading the NEC correctly, section 440.14 all that's required is that
it be in sight of the unit.
R. Tarin
Seems to me you could have an indoor/outdoor problem - but I
can't see your installation. Typically, the service panel is
indoors and the compressor outdoors. In that case, a breaker
in the panel does not protect the person servicing the A/C.
That's the reason for having a disconnect in sight of the A/C.
You want the A/C service person to have uncompromizeable
control over the feed to the A/C.
Ed
So, you seem to be talking about surface wiring.
You MAY technically be OK.
You are pushing the envelope for LOTS of reasons.
1) In a "normal" installation, the technician SEES the cable running from
the unit to the disconnect. When he pulls the disconnect there is no
question which was the "right" disconnect.
2) The panel may be accessible but you are asking the tech to either
"trust you" that your label is right or take the panel cover off.
3) The disconnect adds a Junction Box there the wires go "airborne" for a
foot or two. In many places a different type of cable is used but the box
provides a better anchor for the direction change than just another cable
clamp or whatever you propose.
4) You installation would not LOOK standard.
Look standard?!? I just remodeled a bank and trust me nothing looks standard.
If you are that nervous use a chase nipple.
So, you seem to be talking about surface wiring.
You MAY technically be OK.
You are pushing the envelope for LOTS of reasons.
1) In a "normal" installation, the technician SEES the cable running from
the unit to the disconnect. When he pulls the disconnect there is no
question which was the "right" disconnect.
2) The panel may be accessible but you are asking the tech to either
"trust you" that your label is right or take the panel cover off.
3) The disconnect adds a Junction Box there the wires go "airborne" for a
foot or two. In many places a different type of cable is used but the box
provides a better anchor for the direction change than just another cable
clamp or whatever you propose.
4) You installation would not LOOK standard.
If the situation allows, I would generally run the wiring through the back
of the panel into the crawlspace, and then back out with the lineset. Looks
much neater. This will also allow you a little more flexibility layout-wise
if you're going with 'carflex' for the whip. Just make sure you label
everything properly, including "service disconnect" beside the breaker
label.
John
I'm not "nervous." It's not my place.
I also don't know who put in the air conditioner. If it were installed by
a "professional" he would put in a disconnect without even thinking twice.
I think the OP said it wasn't set yet.
It would be mighty neighborly for the HVAC contractor to do so, but the
practice varies regionally. Especially in union areas where electricians
typically install ALL the wiring. Personally I prefer to do it myself
since, being ultimately responsible, I'm going to go behind someone else and
check their work anyway. Plus I can make sure everything lines up visually.
Circuit breakers for motor protection is not the best situation IMP. The
circuit breaker will meet the code for motor protection as discussed.
Depending on your FLA the breaker could be over sized for good protection.
I like fuses for motors protection cause I can be sure that the fuse will
usually react sooner than the breaker. The fuse must be applied for the
application for this statement to work. Check with your installer and get
the name plate information. The manufacture will state the FLA and the
minimum breaker size needed. If the breaker is say a 30 amp and the FLA on
the compressor is 18 amps, I would want fuses. I would fuse at 20 amps with
a dual element fuse.
Your home your dollars. A 30-60 amp pull out disconnect are not all that
expensive for protection of my a/c.
I don't think he was talking about using the panel breaker for 'motor
protection'. He specifically asked if the panel breaker would meet the
requirements for a *disconnect*. Not the same thing as motor protection.
daestrom
for this statement to work.
In any case, an air conditioner with any kind of warrentee would have some
kind of "built in" overload protection. Most compressors have thermal CBs
inside. Some units shut down when the "high side" pressure exceeds some
point.
The disconnect is just a way to be SURE there is no juice going to the
outside unit.
FYI. The AC was installed today. The installer was more than thrilled with
the method of disconnect. I've known the installer personally for over 25
years and he's been doing this longer than that.
R. Tarin
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