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Old 11-21-2014, 02:11 PM   #1
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Residential Light Switch

The bathroom light switch was getting worn out, so I decided to replace it with one that looked better.

Original switch


Removed and new wall box cut line drawn


New hole cut with a utility knife


New box installed


New switch!
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Old 11-21-2014, 02:53 PM   #2
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Looks very nice! But now you have to do all the rest so they match
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Old 11-21-2014, 03:06 PM   #3
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Very nice upgrade
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Old 11-21-2014, 04:54 PM   #4
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Quote:
Originally Posted by KenHwy61 View Post
Looks very nice! But now you have to do all the rest so they match
Thanks! Our little camper only has one other wall mounted light switch (for the porch light). That one will be a bit more work since it is in the side of a cabinet with a 1/2" thick plywood side wall, not paneling. I do like things to match, so it might be a good winter project!
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Old 11-22-2014, 01:47 AM   #5
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Nice, good to know theirs room for the blue remodel box.
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Old 11-22-2014, 08:43 AM   #6
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Originally Posted by donanddona View Post
Nice, good to know theirs room for the blue remodel box.
don't count on that room everywhere. Especially in exterior walls.
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Old 11-30-2014, 04:47 PM   #7
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Looks great and doesn't look like it was that much work.
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Old 11-30-2014, 05:00 PM   #8
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Nice, good to know theirs room for the blue remodel box.
Note that it's a "shallow" box.
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Old 11-30-2014, 05:08 PM   #9
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Quote:
Originally Posted by MOD Guy View Post
The bathroom light switch was getting worn out, so I decided to replace it with one that looked better.



Original switch





Removed and new wall box cut line drawn





New hole cut with a utility knife





New box installed





New switch!


Great job. Is that just a regular decora rocker switch? I didn't know those worked on 12v. How did you wire it?


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Old 12-01-2014, 01:00 PM   #10
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Hmm, looks fantastic. Another thing to put on the "to do" list for the camper.
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Old 12-01-2014, 10:18 PM   #11
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Is that just a regular decora rocker switch? I didn't know those worked on 12v. How did you wire it?
Any switch that can handle 120VAC can easily handle 12VDC.
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Old 12-17-2014, 05:11 PM   #12
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Realy a nice job. It adds a lot of class.
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Old 12-17-2014, 05:27 PM   #13
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Here's mine. Thank you modguy

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Old 12-17-2014, 07:06 PM   #14
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I would guess that switch is marked "AC only". A commonly applied "rule of thumb" is that switch contacts, relay contacts, contactor contacts and small circuit breaker contacts, which are marked "AC only" can in fact be used on DC but only at about 10% of the rated voltage. So yes, I would say that switch will function fine. DC switches use a snap contact that breaks faster as DC is much harder to break than AC. AC voltage potential hits zero 120 times per second. DC goes to peak and stays there.

It should also be recognized that this is only a "rule of thumb" and that such use may well violate the NEC or other codes and regulations.
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Old 12-18-2014, 12:34 PM   #15
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Originally Posted by MEHoffman View Post
I would guess that switch is marked "AC only". A commonly applied "rule of thumb" is that switch contacts, relay contacts, contactor contacts and small circuit breaker contacts, which are marked "AC only" can in fact be used on DC but only at about 10% of the rated voltage. So yes, I would say that switch will function fine. DC switches use a snap contact that breaks faster as DC is much harder to break than AC. AC voltage potential hits zero 120 times per second. DC goes to peak and stays there.

It should also be recognized that this is only a "rule of thumb" and that such use may well violate the NEC or other codes and regulations.
+1

To put that another way - as you open the switch the current arcs across the contacts, and since AC essentially turns off 120 times per second it is very easy to design a cheap switch that breaks that arc since the electricity itself is helping. Since DC stays on constantly, the switch must be much more robust to break that arc, and at high amperage you could end up with an AC switch that is fully open/off but there is still an arc inside (and whatever you are powering is still on).

That arc will quickly set the switch on fire... then your camper.

In this case that switch is only powering a few lights so it should be ok. If you tried to use it as a master disconnect and all lights were on - maybe 30-35 amps total, you would end up with a meltdown.
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Old 06-25-2015, 08:26 AM   #16
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Originally Posted by techntrek View Post
+1

To put that another way - as you open the switch the current arcs across the contacts, and since AC essentially turns off 120 times per second it is very easy to design a cheap switch that breaks that arc since the electricity itself is helping. Since DC stays on constantly, the switch must be much more robust to break that arc, and at high amperage you could end up with an AC switch that is fully open/off but there is still an arc inside (and whatever you are powering is still on).

That arc will quickly set the switch on fire... then your camper.

In this case that switch is only powering a few lights so it should be ok. If you tried to use it as a master disconnect and all lights were on - maybe 30-35 amps total, you would end up with a meltdown.
That's good info to know. Thank you, I would not have thought of that. This switch only runs one fixture with two bulbs. I will do some observing to see if there is a heat issue with the switch.
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