Making conduit hole in raised cement floor
My garage is on a "raised" cement floor (has a crawlspace) and I'm thinking of running a sub panel to it, and maybe even some plumbing for an utility sink in the future. What would be the best way to make a clean round hole, maybe 8 inches diameter without causing any structural issues? The slab sits on cinder blocks and has a beam in the middle. I'm unsure how thick it is, I am guessing a foot or more. It looks quite heavy duty. The hole would most likely be at one of the corners. Is there issues with this? What type of tool would i use to make such hole? I'm thinking something like what is used to make door knob holes, but bigger and for masonry.
My alternate route is to run this stuff outside. The water would be more tricky though.