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My house walls are primarily made of poured concrete. To run wire through the walls I need to cut a groove in the concrete then plaster over.

Is it possible to use a bit that can cut (slowly) a groove through the concrete?

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    In theory, certainly. But you don't want to even attempt this. Concrete is by no means a homogenous thing, and the catastrophic results of encountering a particularly hard pebble along the path of the groove don't bear thinking about. This is a job for an angle grinder with a suitable disk. Or, the old-fashioned way, a heavy hammer and a cold chisel :-)
    – Graphus
    Nov 2 '20 at 8:45
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    If you could find a diamond straight bit you could probably get away with it. However bear in mind that your router's motor isn't designed for pushing through something as hard as concrete. I'd suggest surface mount EMT conduit or, if you really want it in the wall, you could also use a concrete blade in a circular saw. I'd recommend asking about your wiring plan at Home Improvement - there are a ton of very helpful electricians there who will help ensure your wiring is up to code. Keep in mind that if you do cut a groove, you still have to have the wiring covered some how.
    – FreeMan
    Nov 2 '20 at 14:54
  • I'm voting to close this because it isn't about woodworking. It really belongs in the "DIY" stackexchange site, not this one. Nov 2 '20 at 17:28
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    I am moving this to DIY where I believe it is more on topic.
    – Ashlar
    Nov 3 '20 at 0:31
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    Does this answer your question? How do you comply with NEC receptacle requirements in row homes with brick walls?
    – FreeMan
    Nov 3 '20 at 13:01
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This method or running wire is common or standard in parts of Europe/UK.

But the specialized tools to do it are saws, not routers. There are stone-cutting router bits seen in countertop work that might work, but likely far less efficient than using a saw.

There's an older post here someplace that showed a saw for the exact job from Germany...

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Concrete saws come in all sizes, from big monsters you push like a lawn mower, down to small 6" blades for battery powers Makitas and the like, plus onbviously 4" angle grinders with a masonry blade. I would suggest chaling a line and scoring with a 4" grinder and masonry blade as the cheapest way to score/ groove concrete.

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