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2025SU ELC-119-02BL NEC Calculations
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A service is supplied by parallel feeders installed in two metal raceways, each containing 400 kcmil copper phase conductors. Determine the minimum size of the service bonding jumper for each raceway using a single continuously looped copper bonding jumper.
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A service is supplied by parallel feeders installed in three seperate metal raceways, each containing 4/0 AWG copper phase conductors. Determine the minimum size of the service bonding jumper for each raceway using a seperate copper bonding jumpers for each conduit.
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A service is supplied by parallel feeders installed in three seperate metal raceways, each containing 300 kcmil aluminum phase conductors. Determine the minimum size of the service bonding jumper for each raceway using a seperate copper bonding jumpers for each conduit.
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A 4-wire, 3-phase feeder consists of 300 Kcmil copper conductors in PVC conduit is supplied by a 250 amp breaker. The minimum size equipment grounding conductor to be ran with this feeder would be:
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A 4-wire, 3-phase feeder consists of 3 AWG THHN copper conductors in PVC conduit is connected to a 100 amp fuse. The minimum size equipment grounding conductor to be ran with this feeder would be:
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A 1 ¼ inch rigid metal conduit contains 4/0 AWG, type THHN copper conductors of a circuit protected by a 150 ampere circuit breaker. When required, what would be the minimum size bonding jumper to bond the conduit for this circuit?
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