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Old 06-02-2008, 09:13 PM   #1
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Recessed cans install


I am installing several IC (insulated ceiling) rated recessed cans. Due to the positioning of the cans in relation to the joists, some of the Cerro brand NM-B 14-2 600 volts wire will come in direct contact with the hot cans. (The cans do get hot to the touch with the recommended 75w Halogen bulb)--The wire will be tightly sandwiched between the can and a joist.
My concern is will the wire be able to handle the heat and if so, would installing it this way be within code? The can manufacturer, Halo, tells me no problem as long as the wire is rated at 90 degrees C. What do you guys say?
Should I chisel a recess in the joist for the wire to sit in and then cover the recess with a nail guard?--Or would that be a waste of time?
Thanks.

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Old 06-02-2008, 09:31 PM   #2
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I am installing several IC (insulated ceiling) rated recessed cans. Due to the positioning of the cans in relation to the joists, some of the Cerro brand NM-B 14-2 600 volts wire will come in direct contact with the hot cans. (The cans do get hot to the touch with the recommended 75w Halogen bulb)--The wire will be tightly sandwiched between the can and a joist.
OK, I don't usu. do romex but I don't understand how, at 16" o.c., the cable would have to come into contact with the cans? Why not run it around the other side of the can???

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Should I chisel a recess in the joist for the wire to sit in and then cover the recess with a nail guard?--Or would that be a waste of time?Thanks.
Oh god no. Please. Put the chisel down and move away from the poor, unsuspecting joist.

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Old 06-03-2008, 03:39 AM   #3
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Recessed cans install


use heat resistance sleeves to cover the wire. It can handle some considerable heat to protect wire.
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Old 06-03-2008, 04:33 AM   #4
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Recessed cans install


Newbie,
Would the sleeves be the "heat shrink" type?--Looks like thin black tubing?
Thanks.
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Old 06-03-2008, 03:59 PM   #5
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Not the shrinking type,( they are mainly to cover the bear copper in order to insulate), There are sleeves available, do some shopping around in couple of electrical supplier.
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Old 06-03-2008, 04:36 PM   #6
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Recessed cans install


NM-B is rated at 90 degree C.
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Old 06-03-2008, 06:19 PM   #7
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NM-B is rated at 90 degree C.
NM is rated at 60 deg, 90 if derating 334.80. I could stand corrected but it's how I've always understood the article.
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Old 06-03-2008, 07:34 PM   #8
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MN-B is rated for 90 degree C for derating, but you must use 60 degree C for ocpd.
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Old 06-03-2008, 08:37 PM   #9
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Recessed cans install


The OP stated the manufacturer said everything was fine if the conductors are rated at 90C. That is very common with light fixtures, and NM-B is rated at 90C for that purpose. No mention was made about ampacity or derating. Just the temperature rating of the insulation.
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Old 06-03-2008, 10:13 PM   #10
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as already mentioned, just pick another route for the wire...

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