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Old 05-29-2013, 05:55 AM   #1
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Roof heat cables, dedicated curcuit ?


I am running 100 feet of heating cables on my roof. Can I plug into the outside receptacle. It is a 20 amp circuit. Their are four receptacles on the circuit. Do I need a gfi protected circuit, and does it need to be dedicated. Are their special receptacles used for these heating cables?

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Old 05-29-2013, 06:22 AM   #2
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Roof heat cables, dedicated curcuit ?


You will have to look on the packaging to add up the wattage of the cables. It will usually tell you how many watts/ft.

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Old 05-29-2013, 06:41 AM   #3
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Roof heat cables, dedicated curcuit ?


You do need GFCI protection for those cables.
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Old 05-29-2013, 08:52 AM   #4
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Roof heat cables, dedicated curcuit ?


Most install-it-yourself roof heating cables have plugs for standard 120 volt receptacles.

Outdoor receptacles should have ground fault circuit interrupter protection.

You should limit the heating cable wattage to 80% which is 1900 watts for a 20 amp circuit or 1450 watts for a 15 amp circuit.
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Old 05-29-2013, 11:09 AM   #5
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Roof heat cables, dedicated curcuit ?


Gfi not necessary...there is an exception for snow melting equipment.
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Old 05-29-2013, 11:58 AM   #6
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Roof heat cables, dedicated curcuit ?


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Originally Posted by k_buz View Post
Gfi not necessary...there is an exception for snow melting equipment.
I had to look it up myself, because I wasn't sure. 2011 NEC requires ground fault protection of equipment for snow melting equipment (426.28).
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Old 05-29-2013, 03:46 PM   #7
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Roof heat cables, dedicated curcuit ?


I am trying to figure out why they would even put that exception in there and the only thing I can come up with is that the plug in variety of gutter cables is not considered fixed. But even then the exception doesn't say you can ignore GFI protection. I apologize...this is 2 times in a week I read too quickly.
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Old 05-29-2013, 04:16 PM   #8
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Roof heat cables, dedicated curcuit ?


GFPE is not the same as GFCI and GFI is not in the NEC.

210.8 Ground-Fault Circuit-Interrupter Protection for
Personnel. Ground-fault circuit-interruption for personnel
shall be provided as required in 210.8(A) through (C). The
ground-fault circuit-interrupter shall be installed in a
readily accessible location.
Informational Note: See 215.9 for ground-fault circuitinterrupter
protection for personnel on feeders.
(A)(3) Outdoors
Exception to (3): Receptacles that are not readily accessible
and are supplied by a branch circuit dedicated to
electric snow-melting, deicing, or pipeline and vessel heating
equipment shall be permitted to be installed in accordance
with 426.28 or 427.22, as applicable.

426.28 Ground-Fault Protection of Equipment. Groundfault
protection of equipment shall be provided for fixed
outdoor electric deicing and snow-melting equipment.
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Old 05-29-2013, 06:32 PM   #9
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Roof heat cables, dedicated curcuit ?


If the heat cable is plugged into an exterior 120V receptacle, it must be GFCI protected. All exterior 120V receptacles require GFCI protection, regardless of what's supposed to be plugged into them. If it were direct-wired or ran on something other than 120V, then it would be OK to use GFPE instead of GFCI - but GFPE breakers are more expensive and harder to find.
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Old 05-29-2013, 06:36 PM   #10
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Roof heat cables, dedicated curcuit ?


Quote:
Originally Posted by mpoulton View Post
If the heat cable is plugged into an exterior 120V receptacle, it must be GFCI protected. All exterior 120V receptacles require GFCI protection, regardless of what's supposed to be plugged into them. If it were direct-wired or ran on something other than 120V, then it would be OK to use GFPE instead of GFCI - but GFPE breakers are more expensive and harder to find.
Did you read the exception I posted?

And yes GFPE breakers are nasty expensive.
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Old 05-29-2013, 07:51 PM   #11
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Roof heat cables, dedicated curcuit ?


Quote:
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Did you read the exception I posted?

And yes GFPE breakers are nasty expensive.
Ha, nope. I had the page open for a couple hours before I posted my response and didn't refresh it first! I did not realize the melting/GFPE rule provided an exception to the receptacle GFCI requirement. That's interesting.
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Old 05-29-2013, 11:48 PM   #12
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Roof heat cables, dedicated curcuit ?


Quote:
Originally Posted by Code05 View Post
Did you read the exception I posted?

And yes GFPE breakers are nasty expensive.
Also not many place do carry GFPE breaker at all that useally a special order item and almost all the big box store I know of they don't stock them at all.

Just the common run of mill GFCI.

Readers just beaware that the GFCI and GFPE is not the excat the same beast as you think of.,,

The common GFCI are set at 6ma range.

The GFPE are not common and they are set at 30 ma level which it will not be used for personal protection on North Americian side at all.

Merci,
Marc

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