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What voltage systems can Combination Service Entrance Devices be applied on?

The CSED devices can be used on a 120/240Vac, 1 Phase/3 Wire service. Most, but not all, CSED devices can also be used on a 120/208Vac, 1 Phase/3 Wire service derived from a 208Y/120Vac system. A fifth jaw is required for use on the 120/208Vac service.

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