Quick Reference · Electrical Field Guide
Hole Size & Drill Bit Guide
Conduit knockouts, pot light cutouts, concrete fasteners, and clearance holes — all in one place. Use the finders below or search anything: "1-1/4 EMT", "Tapcon 1/4", "6 inch pot", "3/8 wedge".
Conduit Knockout Finder
EMT · Rigid · PVC · Trade size ? KO diameter
1-3/4"
Knockout hole diameter · Use a hole saw or KO punch
Pot Light Cutout Finder
Recessed / wafer · Always verify spec sheet
4-1/4" to 4-3/8"
Typical cutout range · Confirm on fixture spec sheet
Concrete Fastener Finder
Tapcon pilot sizes · Wedge anchor drill sizes
3/16" masonry
Most common for electrical conduit straps
Clearance Hole Finder
Strut · Steel · Mounting plates · Bolt pass-through
5/16"
Good for 1/4" strut bolts
Most asked at the counter
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| Category | What you're installing | Trade size / spec | Hole / drill size |
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Quick reference only. Pot light cutouts vary by manufacturer model — always confirm on the fixture spec sheet before cutting. Concrete fastener drill depths depend on material hardness and embedment requirements. Verify all dimensions against the manufacturer's installation instructions and applicable electrical code.
