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Are the concentric knockouts in the load centers, metering, or safety switches rated for grounding (or bonding) in accordance with the NEC, using a standard nipple or connector?
Issue:
Product Design Features
Product Line:
Load Centers, Safety Switches and Metering
Resolution:
No. There is no test in the UL standards for these product lines for the knockouts of the enclosures. The test for this requirement is found in UL 514A (Standard for Safety - Metallic Outlet Boxes) only. The enclosures for load centers, metering, and safety switches are manufactured to the UL 50 standard. The installer MUST use a "Bonding Bushing" for such a connection or follow what the code requires.
Product Design Features
Product Line:
Load Centers, Safety Switches and Metering
Resolution:
No. There is no test in the UL standards for these product lines for the knockouts of the enclosures. The test for this requirement is found in UL 514A (Standard for Safety - Metallic Outlet Boxes) only. The enclosures for load centers, metering, and safety switches are manufactured to the UL 50 standard. The installer MUST use a "Bonding Bushing" for such a connection or follow what the code requires.
Released for:Schneider Electric USA
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