How wrong is this wiring idea? (lemmy.world)

submitted 6 months ago by lettruthout@lemmy.world to c/electricians@lemmy.world

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Can I put an additional load before switches on a dedicated circuit?

The example circuit goes from the service panel to a two-way (SPDT) switch at the house back door. From there the circuit goes to another two-way switch out in the garage. The circuit then powers the garage lights.

The goal is to add additional lights on this circuit near the service panel so that the same switches would also control the new lights.

How wrong would it be to add this new load between the service panel and the first two-way switch? This would save the (huge) effort to run wire from the garage back to the house.

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[-] ironhydroxide@sh.itjust.works 8 points 6 months ago

You're essentially asking if you can add a light in series with other lights. Almost all ac lighting is done in parallel, thus the live and neutral at each socket.

Technically it would probably work, but if your light can't handle the full load current of the other lights on the circuit, it'll burn out and then cause those lights to go out as well.

[-] ocassionallyaduck@lemmy.world 3 points 6 months ago

This.

Without further context on the install location it is hard to say but it seems like this should be something you could avoid doing with a slightly different design.

[-] lettruthout@lemmy.world 1 points 6 months ago

Of course… Something was nagging at me that I shouldn’t do this. Your reply’s mention of being serial was the source of the nag. I’ll explore damium’s current sensing idea instead. Thank you!

[-] Soolonkivi@lemm.ee 1 points 1 month ago

No, they wouldn't burn out, the garage lights would only work when the light near the panel is lit and both lights would be dimmer if lit at the same time.

[-] damium@programming.dev 2 points 6 months ago* (last edited 6 months ago)

I'm not an electrician so I don't know if it would be up to code (very likely is not) but you might be able to use a current sensing relay to trigger the lights. For safety I would add a local disconnect as well.

[-] lettruthout@lemmy.world 1 points 6 months ago

Great ideas! This sounds like a much better approach. Thanks!

this post was submitted on 21 Apr 2024

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