Adding two lights to existing light


The proposed wiring shown as Revision 1 in the original drawings is not code compliant. Under NEC 300.3(B), all wires for a given circuit must be in the same cable or raceway. In your example, the new lights get the hot lead from a single wire from the switch and the neutral from a separate cable or raceway from the old fixture.

Basically you need a balanced load in each cable or raceway (hot out/neutral back or hot out/switched hot back) to prevent the possibility of induction heating.

As @Speedy Petey suggests, a much simpler, and code compliant method, is to run a cable with a neutral and a switched hot from the existing fixture to the new fixtures.

UPDATE: Based on the added drawing in Revision 2, the proposed circuit is now code compliant. Also, as @Ben noted, any white wire used as a hot that is exposed in a box or fixture must be marked black or red with tape, paint or marker to show that it is...

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PJ just helped me with some HVAC wiring in the themostat forum so now I'm on to my next project:

I currently have a single light and outlet in the middle of my attic, controlled by a switch in the hallway below.

Want to add 2 additional lights in the attic, one on either side of the existing one, all working off the same switch. My plan for each new light was to just run new 12/2 romex to either end of the attic, and tap into the existing hot and neutral wires at the ceiling box for light #1, just like the adjacent outlet currently looks to be doing. Basically like this for each light:

I think this seems pretty straightforward, but wanted to make sure I'm not missing anything. Also that junction box will then have 5 sets of black/white wires to connect (switch + outlet + 3 lights) - issue with that or my plan in...

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I am a bit of a novice when it comes to wiring so hoping someone may be able to help me.

I have a light in my lounge that is 2 way with another switch in my hall. I am adding a new light to my lounge where the intention was originally to just replace the original light with the new light using the existing wiring/switch which is not too far away. I am hoping now instead to change the existing switch in the lounge to a 2 gang, using the power from the existing circuit to then wire to the additional light (meaning I have the two lights working independent from each other with the existing light being 2 way and the new light 1 way). Is this something that will be possible? I wasn't sure if the fact that the existing light is 2 way complicates things?

I checked the wires in the existing switch and there are 2 reds, 1 black and the earth. There is also some form of junction box further down the wall which I presume is part of the lighting circuit.

Can anyone...

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Guide to Adding a Light Fixture

Electrical Question: I’m attempting to add a second light fixture to an existing wiring run, which currently has a single fixture attached to a single pole switch.

The power currently comes into the fixture. I’d like to avoid replacing the wire that’s run to the switch if possible, which is 12-2, and simply pass the hot through the new second fixture to the switch. Is this possible? The wiring configuration would have the power entering on the far left, and the switch located on the far right.

Any help would be greatly appreciated!

This home electrical wiring question came from: Troy, in Poland, Ohio.

Dave’s Reply:
Thanks for your electrical wiring question Troy.

How to Install One or More Light Fixtures to an Existing Light Fixture

Skill Level: Intermediate to Advanced.
Tools Required: Basic Electricians Pouch Hand Tools, hole saw and drill motor, drop cloth, a Voltage Tester and a fiberglass...

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Security up and electricity costs down! That about sums up this fix.

When analyzing the most effective burglary deterrents, we recently referenced a research paper based on a survey of convicted burglars in which 24% said outdoor lighting was part of their risk assessment before deciding to break into a house.


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Perhaps you've added a workbench or storage area that requires additional light. Adding light fixtures to an existing light circuit can easily provide the needed lighting.

Shut off the electrical power to the garage at the home's main breaker or fuse panel.

Access the garage attic space or the ceiling joists from a stepladder (for unfinished garages) and determine the desired location for the new light fixture. For drywalled garage ceilings, use a screwdriver or awl to poke a hole through the drywall beside the ceiling joist at the new fixture location.

Attach the electrical ceiling box to the side of the ceiling joist at the new fixture location. For a garage with a drywall ceiling, hold the ceiling box against the ceiling surface at the marked area and scribe the box outline on the drywall. Cut hole for the box using a jab saw. Position the ceiling box over the hole and attach the box to the side of the ceiling joist at the new fixture location...

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outside of a few staples the wiring you show looks ok. We should be able to make this work as shown. So I am making the assumption that we miss wired something. we can't rule out bad fixtures/wrong bulbs/bad install. That main jbox is over box fill, putting an extendstion ring on it would take care of that code violation.

As the switch has only two wires this is power thru light.

I am curious to know why there are two cables labeled incoming power.

I am hoping most of the wiring is visible or you can guess where it goes.

Lets make some sense of the spaghetti:

the incoming cable from the breaker is our HOT. we could find this by testing if we needed to. This incoming white would be our "king" neutral. there would most likely be a large number of whites on this connection.

any cables to a recp or jboxes continuing the circuit would be hooked straight up(white to white, black to black)

the cable going to the switch would have its...

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Hi, everyone! I have a switched ceiling fixture in my entryway. I would like to add two more fixtures within a few feet of the original fixture, ending up with 3 separate lights hanging instead of one. I need the existing switch to work them all.

I want to use 3 rice-paper shades on hanging pendants, so my original thought was to go into the attic and wire a power bar in to the existing fixture, then use plug-in lamp kits for the two additional lights. After reading through the forum, though, that sounds like a dangerous way to do it.

However, I still don't understand the proper way to accomplish adding the two fixtures.

I changed the light fixture when I bought the house, so I know there are no surprises on the fixture box thingy - one black wire, one white wire, and a ground.

I would greatly appreciate your help and expertise....

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