LV and Mains in same box
#1
03-16-04, 02:33 PM
LV and Mains in same box
Hi,
I am wondering if it is illegal and/or bad practice to mix a low voltage and a mains (240v in UK) in the same switch box.... They are MK grid switches, with 2 5amp standard SPST switches, and one is connecting a light bulb. I want the other to control a 12vdc circuit. Is it bad to do this? What about if I opto-isolate the switch from the rest of the LV circuit? if I can't do this, can you suggest any other ways? I'd really like to use the MK grid setup as they are used everywhere else in the house.
thanks,
computer
I am wondering if it is illegal and/or bad practice to mix a low voltage and a mains (240v in UK) in the same switch box.... They are MK grid switches, with 2 5amp standard SPST switches, and one is connecting a light bulb. I want the other to control a 12vdc circuit. Is it bad to do this? What about if I opto-isolate the switch from the rest of the LV circuit? if I can't do this, can you suggest any other ways? I'd really like to use the MK grid setup as they are used everywhere else in the house.
thanks,
computer
#3
03-16-04, 06:30 PM
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joed, not to get into a big thing but the issue is with conductor insulation rating and not voltage. You can mix low and line voltage but it is usually not a physically smart thing to do as they usually need to go to different termination points.
See NEC300.3(C)(1)
See NEC300.3(C)(1)
#5
03-17-04, 03:09 PM
Originally posted by Speedy Petey
joed, not to get into a big thing but the issue is with conductor insulation rating and not voltage. You can mix low and line voltage but it is usually not a physically smart thing to do as they usually need to go to different termination points.
See NEC300.3(C)(1)
joed, not to get into a big thing but the issue is with conductor insulation rating and not voltage. You can mix low and line voltage but it is usually not a physically smart thing to do as they usually need to go to different termination points.
See NEC300.3(C)(1)
#6
03-17-04, 04:41 PM
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computer,
Zip style cord has a very low temp rating and should never be installed in any conduit or concealed in walls.
I have no clue about your systems in the UK so I really don't want to give you the wrong advice with regard to the rest of your question.
Sorry joed. I almost didn't write that post.
I should have assumed you knew that article.
I should also follw my first instinct.
Zip style cord has a very low temp rating and should never be installed in any conduit or concealed in walls.
I have no clue about your systems in the UK so I really don't want to give you the wrong advice with regard to the rest of your question.
Sorry joed. I almost didn't write that post.
I should have assumed you knew that article.I should also follw my first instinct.
