Can I Mix Conduit And Romex - Electrical - DIY Chatroom - DIY ...

Today, 09:47 AM	? #1
Member ? Join Date: Dec 2011 Posts: 43	Hello all. I am working on a septic Alarm project (I currently don't have an alarm). I have become convinced that PVC conduit from the house to the septic pump tank is the best way to go. In that conduit, as I understand it, I want to run #12 stranded THHN. So for power to the pump the wires will be one black, one white, and one green. (The pump is 110/20 amp half horsepower) Because I am thinking about keeping the alarm inside the basement, I will need to also run wires through the same conduit for the alarm float switch. What color and size wire should these be? Finally, here is the hard question. From the main service panel to the point of penetration for the conduit is ~20 feet. What I would like to do is run #12/2 with ground romex. In the junction box at the point where the conduit penetrates the wall I would like to put a plug for the alarm. So here is what would be in the junction box. 1-plug splices going from romex to stranded THHN 2 wires passing through for the alarm float switch Is any of this legal (VA, USA)? Otherwise I will buy an external alarm and pump control panel. Run romex from main service panel to a junction box. Switch to stranded THHN for the run inside the pvc conduit which goes to the septic control panel at the septic pump chamber. Thank you, Fred
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Today, 09:58 AM	? #2
Member ? Join Date: Dec 2011 Location: New york Posts: 696	What's the voltage of the float switch?
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Today, 10:22 AM	? #3
Member ? Join Date: Dec 2006 Location: Midwest Central Illinois Posts: 5,622	I see no problem doing it that way. __________________ Ren: Now listen, Cadet. I've got a job for you. See this button? Ren: Don't touch it! It's the History Eraser button, you fool! Stimpy: So what'll happen? Ren: That's just it. We don't know. Maybe something bad, maybe something good. I guess we'll never know, 'cause you're going to guard it. You won't touch it, will you?
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Today, 10:33 AM	? #4
Member ? Join Date: Nov 2011 Location: PA Posts: 273	Quote: What's the voltage of the float switch? Quote: I see no problem doing it that way. I agree, but if the float switch is low voltage make sure the wiring going to it is rated as high or higher than 120 volts.
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Today, 10:39 AM	? #5
Member ? Join Date: Mar 2005 Location: Welland, Ontario Posts: 4,243	As long as you use the same thwn rated wire you are using for the pump no problem running them in the same conduit, not matter what the voltage. It's the insulation rating of the wire that is important. Use any colour you wish except for green for the alarm. No problem with the junction box either. __________________ Do not PM with questions that can be asked in a forum. I will not respond.
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Today, 10:49 AM	? #6
Member ? Join Date: Dec 2011 Location: Michigan Posts: 231	Quote: As long as you use the same thwn rated wire you are using for the pump no problem running them in the same conduit, not matter what the voltage. It's the insulation rating of the wire that is important. Use any colour you wish except for green for the alarm. No problem with the junction box either. joed, let me make sure I get this one right. You can run mixed voltage in the same conduit as long as the wire has the same rating, to match the highest voltage/amps? Writer?s information is for discussion purpose only and should be confirmed by an independent source.
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Today, 10:55 AM	? #7
Electrical Contractor ? Join Date: Jun 2004 Location: Newnan GA Posts: 3,315	Quote: joed, let me make sure I get this one right. You can run mixed voltage in the same conduit as long as the wire has the same rating, to match the highest voltage/amps? Writer?s information is for discussion purpose only and should be confirmed by an independent source. That is correct. The lowest voltage wire has to have the same rating as the highest voltage wire. __________________ Yes I am a Pirate, 200 years too late. "Jimmy Buffett"
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Today, 10:58 AM	? #8
Member ? Join Date: Dec 2011 Location: Michigan Posts: 231	Quote: That is correct. The lowest voltage wire has to have the same rating as the highest voltage wire. I know these things, just can't remember why anymore.
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Today, 11:00 AM	? #9
Member ? Join Date: Mar 2005 Location: Welland, Ontario Posts: 4,243	Quote: joed, let me make sure I get this one right. You can run mixed voltage in the same conduit as long as the wire has the same rating, to match the highest voltage/amps? Writer?s information is for discussion purpose only and should be confirmed by an independent source. That is correct. Also note that wire being underground must be THWN rated. It was stated as THHN in the original post. However most THHN is also rated THWN. Just make sure it is dual rated. __________________ Do not PM with questions that can be asked in a forum. I will not respond.
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Today, 11:01 AM	? #10
Electrical Contractor ? Join Date: Jun 2004 Location: Newnan GA Posts: 3,315	__________________ Yes I am a Pirate, 200 years too late. "Jimmy Buffett"
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Today, 11:17 AM	? #11
Member ? Join Date: Dec 2011 Location: Michigan Posts: 231	Quote: That is correct. Also note that wire being underground must be THWN rated. It was stated as THHN in the original post. However most THHN is also rated THWN. Just make sure it is dual rated. yes I know this thanks.
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Today, 11:21 AM	? #12
Member ? Join Date: Dec 2011 Location: Michigan Posts: 231
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Today, 11:52 AM	? #13
Member ? Join Date: Nov 2011 Location: PA Posts: 273	Quote: I agree, but if the float switch is low voltage make sure the wiring going to it is rated as high or higher than 120 volts. True, just using all 600 volt wiring is the easiest way but there seems to be some misunderstanding with the voltage ratings in the same conduit. First, bare wire has no voltage rating, it is the insulation that gives it a "voltage rating". 300.2 Limitations. (C) Conductors of Different Systems. (1) 600 Volts, Nominal, or Less. Conductors of ac and dc circuits, rated 600 volts, nominal, or less, shall be permitted to occupy the same equipment wiring enclosure, cable, or raceway. All conductors shall have an insulation rating equal to at least the maximum circuit voltage applied to any conductor within the enclosure, cable, or raceway. So I stand by my original post in saying that the OP is code compliant by using wire of different voltage ratings as long as ALL wires are listed above the maximum voltage.
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Today, 12:24 PM	? #14
Member ? Join Date: Dec 2011 Posts: 43	Quote: Originally Posted by joed That is correct. Also note that wire being underground must be THWN rated. It was stated as THHN in the original post. However most THHN is also rated THWN. Just make sure it is dual rated. It still must be THWN even in conduit?
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Today, 12:37 PM	? #15
Member ? Join Date: Nov 2011 Location: PA Posts: 273	Quote: It still must be THWN even in conduit? Yes absolutely...conduit is considered a wet location. Most THHN is also listed as THWN. I'm not sure you could still find THHN only.
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