EXT wrote:
I would use the larger size, 1/4" for a service panel. Ignore the advise to
drill into the mortar joints, they are often soft compared to the actual
concrete block, easy to drill but also easy to strip the threads as you
drive the screw in. You need to drive into something hard to hold the screws
solidly.
snip

I guess it's ok to drill the holes?


I suggested the mortar joints because the block is hollow and can be
crumbly and tapcons may not hold. Don't ask me how I know.

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