Allen Bradley 1771 A2B Product data
Main & Complementary
Each enclosure must contain a central ground bus. The ground bus is the common connection for each chassis within the enclosure and the enclosure itself. Use either bolts or welded studs to mount the I/O chassis and central ground bus. If you are mounting a chassis to the back panel of an enclosure, use 1/4-20 (M6 x 10) mounting bolts.

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