Drill bits come in every shape and size for all types of jobs, from drilling through masonry to fine craftwork. The most common bits most of us have seen are twist bits that are sold both individually and in sets based on gradation. Twist bits are fine for small holes, but they’re not much use in electrical work except for running small, low-voltage wires.
Electricians run more than one cable through a hole whenever possible, and larger holes (one inch in diameter) are drilled with another type of drill bit. The following are the most common bits for drilling larger holes:
➤ A spade bit
➤ An auger bit
➤ A power bore bit
When running a single cable through a wall stud or joist, a 5/8-inch hole usually is drilled.
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