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NEMA WC 50
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NEMA WC 50 76th Edition, January 1, 1976 Ampacities Including Effect of Shield Losses for Single-Conductor Solid-Dielectric Power Cable, 15kV Through 69kV (Copper and Aluminum Conductors)
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Description / Abstract:
This publication presents calculated ampacities for single-conductor solid-dielectric 15 through 69 kV power cables with bonded and grounded shields, copper or aluminum conductors, spaced or trefoil† configurations, single or double circuits, directly buried or in buried ducts. Ampacities are given for four different shield resistances for each conductor size. For spaced cables, ampacities are also given for open-circuited shield operation.
†Trefoil—Three cables which have been installed in close contact and which may or may not have been bound together at the time of installation.
†Trefoil—Three cables which have been installed in close contact and which may or may not have been bound together at the time of installation.