Unlike conventional shaft grounding brushes, which call for occasional maintenance or replacement, the microfibers of a bearing protection ring work with no friction or wear — less than 0.001 in. per ...

All Code references are based on the 2005 NEC. The grounding and bonding requirements in this column apply to solidly grounded systems that operate at not more than 600V, such as 120/240V, 120/208V, ...