# Code for number of circuits ran next to one another

I’ve looked around for an answer to this but keep finding split branch circuit topics which isn’t what I’m looking to do.

I’m planning to run 4 circuits to one side of my house. These runs would go into the attic. I also see where a few other circuits could also have a run along the same rafters/path before going a different direction/room. I’m trying to figure out what the best way to have about a 20’ run where these 4-6 circuits are next to one another before going their separate ways. It just seems a bit ridiculous and maybe a structural issue to bore 6 holes laterally in a series of rafters to run the 6 different circuits.

Hopefully this makes sense the way I described it. I’m not entirely sure if conduit or two conduits on the rafters would be the way to go with this or some other solution that meets code.

• Don't know if there is a code for open air circuits. There is for the number of wires in each size of conduit. As long as you give each cable a tiny bit of space, you should be good. Holes in wood structural members need to be less than 40% of the wood, but a few holes can be spaced out. Commented Sep 26, 2023 at 20:07
• Depending on power needs of these circuits, access, and specific topology of the distribution at the far end, it might be more appropriate to run a single larger cable through your attic and put in a subpanel with individual breakers for each area at that subpanel location. Then you just need to run a 40A line (or whatever you actually know you need from a load calculation) from your main panel to your subpanel. You could even use aluminum for the subpanel feed, since aluminum is a lot cheaper than copper, and as long as it's installed and sized properly, is ideal for feeding subpanels. Commented Sep 26, 2023 at 21:09
• @Milwrdfan I thought about a sub panel but really it’s a pretty small footprint, around 1000 sqft house. The problem I’m trying to solve is having two rooms and a bathroom + other misc outlets all being fed from one breaker and poorly wired circuit. Effectively half the house is ran off one breaker currently, it’s a mess. Hence one circuit for each room, one for the bathroom light/fan and one dedicated to a Gfci outlet to the bathroom. Plus a couple of circuits that are nearby that could share the same main run from the panel. Commented Sep 26, 2023 at 21:26