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Old 10-18-2009, 06:58 PM   #31
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Bathroom light/exhaust fan/heater wiring


All is well and you don't have to run any extra wires. If you're ready I'll tell you how to hook it up.
You will need a voltage tester to do this.

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Old 10-18-2009, 07:04 PM   #32
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Bathroom light/exhaust fan/heater wiring


Thanks so muc, I'll digest this and follow WIllie's post (#21). Thanks sooo much for your time/efforts, gotta go take care of the kid.
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Old 10-18-2009, 07:08 PM   #33
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Bathroom light/exhaust fan/heater wiring


RS1, please tell me yes, I have a voltage tester...or you can email me @

cgiron@cox.net. Thanks gotta run for the night, will tackle next weekend!!
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Old 10-18-2009, 07:23 PM   #34
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Bathroom light/exhaust fan/heater wiring


The Broan 100HL diagram shows one 20A supply circuit is required for this fixture rated at 14A. The supply circuit goes to the switches, and has one 12-2 cable going to power the heater, and a 12-3 to power the light & fan.

But I see no reason why they specified to have 2 neutrals going up to the fixture, unless I'm missing something in the code or UL listing requirements that would require the heater to have it's own neutral. But since the installation instructions have it that way, you should try to do it that way.
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Old 10-18-2009, 07:38 PM   #35
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Bathroom light/exhaust fan/heater wiring


So then I DO need to run another wire for this installation?

This is why I'm confused.....if I follow the instructions I have to run a new wire...I was trying to see if there was a legitimate and safe workaround...thought?
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Old 10-18-2009, 07:57 PM   #36
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Bathroom light/exhaust fan/heater wiring


No-I just analyzed the specs that Willis posted. The other neutral is probably shown for simplicity. I agree with Willis. One of the neutrals can be used as a switch leg as long as it is re-identified correctly. Don't over analyze the specs, all you need to do is hook this thing up EXACTLY as it was connected before.

If you are really ready to take some step by step instructions, I can give you a little more time tonight and can talk you through this. Since I have some time invested in your project, I would love to see it resolved too.
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Old 10-18-2009, 08:33 PM   #37
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Bathroom light/exhaust fan/heater wiring


SO I would just need to wire according to the diagram, but swap the white neutral wire going to the heater and attach it to the blue wire of the light/fan? Basically disregard the "extra" neutral going from the switch to the heater and use it as the "red" wire (extra wire I don't have) from the "light" switch to the "blue" wire at the unit? Connect both neutral (white) wires @ the unit to one white coming from switch.

Please let me know if this is correct...also what's the easiest method of figuring out which wires are which from the box (wall switch) to the attic? I was thinking I could attach a pair of wires at the switch to the load wires then use a volt meter to see which are hot? Is there an easier way?

Last edited by Redlos; 10-18-2009 at 08:42 PM.
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Old 10-19-2009, 08:11 AM   #38
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Bathroom light/exhaust fan/heater wiring


The mfg probably shows it having two cables to be inaccordance with NEC 300.3(B) which says conductors of the same circuit must be in the same conduit, cable, etc.

This means that using one of the 12-2 to run two hots doesn't conform to the code because the neutral of those two hots is technically in another cable. That's why they show two cables, so each cable has the neutral for the hots that are in that cable.

(B) Conductors of the Same Circuit.
All conductors of
the same circuit and, where used, the grounded conductor
and all equipment grounding conductors and bonding conductors
shall be contained within the same raceway, auxiliary
gutter, cable tray, cablebus assembly, trench, cable, or
cord, unless otherwise permitted in accordance with

300.3(B)(1) through (B)(4).
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Old 10-19-2009, 09:33 AM   #39
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Bathroom light/exhaust fan/heater wiring


So if I give up on running the extra wire and use only one shared neutral wire, I'll be out of code.....is this "unsafe" or in any way hazardous? or just out of code?
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Old 10-31-2009, 04:21 PM   #40
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Bathroom light/exhaust fan/heater wiring


Thanks so much for your help guys. Since we got some cooler weather in Baton Rouge, I took the opportunity to get back in the attic. The wiring worked perfectly, shared the neutral and used the unused white wire as my "extra" leg. I truly appreciate your efforts to help me out, take care!!

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