Hi everyone,
I'm running some conduit in my shop for 240vac single phase. Is it ok for them to share a common conduit that has 120vac outlets on it? I am trying to do everything up to code and safety.
i.e.: I have a line that runs on walls with 120volt outlets, I would like to run a 240 line in same conduit and have it come out at end of run and have its own outlet/box.
Thanks
"V8TR4" for them to share a common conduit that has 120vac outlets on it? I am
Should be perfectly acceptable to place both in the same conduit. Just make sure you use appropriately sized wire to the load you will have on it. Also, take length of run into account when sizing wire, if it is a longer run, you may need to go up one size wire to account for the resistive losses in the wire.
Perfectly OK but make sure the number of conductors and "ins/outs" of the junction boxes meet NEC specs. ...lew...
V8TR4 wrote: (clip)Is it ok for them to share a common conduit that has
120vac outlets on it? (clip) ^^^^^^^^^^^^ I don't know the code, but logically, if you can run two hots and a neutral for your 240, you can pick off 120 at any point without any additional wires. How could that be unsafe?"Leo Lichtman" wrote in news:aEbTb.43871$ snipped-for-privacy@bgtnsc04-news.ops.worldnet.att.net:
Unbalanced load. You do not want to do this.
The neutral is sized to return current for any one of the branch circuits. So even if only one ckt is running at full load, the neutral will be correctly sized. Add more load on the opposite phase, and the neutral current drops towards zero.
In many locations kitchens are wired with split circuits this way.
Jim
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One other thing on this. When pulling your wire through a conduit with wire already in it...be Extra careful not to "burn" the insulation off of the other wires. Basically use a wire lube of some sort & or pull slowly. As far as code I can't help you there. This just comes from my back ground in data wiring....and my own shop electrical work.
Reno, Paul
"V8TR4" them to share a common conduit that has 120vac outlets on it? I am trying to
Hate to keep this thread going, but you are supposed to fuse a cirucit for about 125% of expected load. If you fuse it properly for the 240 appliance(s), and add a couple of 120 volt 20 amp outlets, how do you fuse it properly? Besides, it's not good practice to have lights on that 240 volt ckt. If you blow the 240, and it is night time, you could end up in the dark, a safety hazard.
Pete Stanaitis
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jim rozen wrote:
So far no one has mentioned the fact that there are rules for how many of what sized wires you can put in a certain size conduit. If you follow the rules, there will be no problem.
Pete Stanaitis
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V8TR4 wrote:
As you said, you fuse it for the expected load. That will be the maximum expected combination of the loads on the circuit. That may not just be the simple sum of the loads on the circuit, since some loads might not be expected to be on at the same time as others. For example, you wouldn't expect a window air conditioner and a strip heater to be on at the same time.
In any case, the fuse/breaker is there to protect the *wire*, not the load. If the load needs protection, it has to supply its own internal fusing. In reality, what you do is choose the wire gauge to have sufficient ampacity for the maximum combination of expected loads, then size the fuse/breaker to protect that.
Gary
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