Grizzly Model G8027 Instruction Manual page 18

Ensure that the entire system is grounded. If
using plastic blast gates to direct air flow, the
grounding wire must be jumped (Figure 15)
around the blast gate without interruption to the
grounding system.
Plastic Blast Gate
Metal Duct
Copper Ground Wire
Figure 15. Ground jumper wire when using
plastic blast gates or elbows and metal duct.
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