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Electrical Wiring for Light Switches

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How Not to be a Human Light Bulb

Differences Between Commercial and Home Light Switch Wiring

Electrical Question: How do I wire two separate lights and switches in one supply junction box?

  • I have a junction box with a top conduit that goes to 1 switch and 1 light
  • The left side top conduit is the feed are power supply coming from another junction box
  • The bottom left side has a conduit for a light and 1 switch
  • The right side is 2 conduits that are controlled by switch 2 which is bottom conduit

These are to separate rooms with 2 separate switches.

  • I need to know how to wire the orange wire is confusing to me that is coming from light fixture 1.
  • I think it should be black.
  • Then the 2 wires with black tape need to know why they did that.

This is a commercial medical plaza in Laguna.
I really appreciate your help about how to do this, and why it is wired this way.

This electrical question came from: Chris, a Handyman from Laguna, California
See more about Home Wiring for California

Dave’s Reply:
Thanks for your electrical question Chris.

May I make a suggestion to you?

  • Because you are a handyman and you are working in a commercial medical building which has 277/480  volts I do not recommend that you perform this electrical work.
  • This higher voltage requires a qualified electrician and from what you have described you do not have enough understanding to perform such as task.

This website helps educate home electrical wiring methods.
The information below will help assist others with home wiring methods.

Electrical wiring is nothing to mess with if you do not understand what you are doing,
so if that’s you, then don’t even guess or try anything.

  • Call a Professional: a Licensed Electrical Contractor

Yes, home electricity can kill you, and commercial power such as described above is extremely dangerous.

The Following links will assist you with your electrical question:

Switch wiring diagrams
Electrical Wiring Diagrams

  • Home electrical wiring diagrams are an important tool for completing your electrical projects.
  • An electrical wiring diagram can be as simple as a diagram showing how to install a new switch in your hallway, or as complex as the complete electrical blueprint for your new home or home improvement project.


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Wiring Diagrams Directory

You identified your project to be about Light Switch Wiring, so you might find this information useful:

Light Switch Wiring
Light Switch Wiring
Wiring a Light Switch – Diagram 1
Fully explained pictures and wiring diagrams about wiring light switches describing the most common switches starting with photo diagram 1.

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3 Responses to “Electrical Wiring for Light Switches”
  1. http://www.ask-the-electrician.com is really a walk-through for all of the info you wanted about this and didn’t know who to ask. Glimpse here, and you’ll definitely discover it.

  2. Steve says:

    Hi, My question is rather simple yet after reading 20 different blogs have come to think it may need more thought. I am remolding my kitchen and it’s in a home built 50 some odd years ago. After removing the walls, insulation and ceiling the wiring used is BX (AC,MC?) depending on your definition. There is no way to remove the wire because they feed different parts of the house. I don’t know what the old electricians were thinking when they ran wire, what a mess. Anyway I want to replace all that I can but how do I connect the old feeds to a source? I don’t have space for juction boxes in these locations. I was told that the ceiling cables can be boxed inside the recess light can with a new power feed? Also can I leave the old cable in say a outlet box and switch boxes along side a new feed and outlet? I hope you understand what I’m trying to say here. Many thanks, Steve

    • Dave Rongey says:

      Hi Steve – yes, I know exactly what your describing because I have rewired several homes.
      Steve, The existing wiring will need to be identified so you understand the purpose of each cable. Once you have done this then the cables may be either dead ended or terminated, or spliced with a new power or circuit source in an existing wall switch or outlet box, or ceiling fixture box if the space of these boxes permits. I personally would not use a recessed light fixture box for a splice or junction box. Basically, if an old wire or cable cannot be removed then it should remain in an electrical box and capped off. If you install a new outlet or other box then yes, the older wiring can remain in its existing box where you may place a blank cover over it. You may also consider replacing the existing box with a deeper box which could contain both the old wiring and new wiring.

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