Answered Essay: in a paralled three phase, four wire service 4- 300kcmil thwn copper per phase, what size grounded n

in a paralled three phase, four wire service 4- 300kcmil thwn copper per phase, what size grounded neutral conductor is required when installed in a single conduit run using rigid metal conduit?

using nec2014 mention table or article used.

Expert Answer



THHN OR THWN is thermo artificial High Heat RESISTANCE Nylon coated wire.

These are two types

Stranded or soiled.
Given 300kc mil means 300 AWG has 37 starnds.In single conduct using metal Condit organization for three phase authority by means of 4 wise systems require ground wire by means of 1.5 times the core of phase wise. As size of each phase case is 300AWG, Ground wise required is 450AWG wise.But 450 not available hence 500 co mil must exist chosen
CONCLUSION: 500 coil ground wise should be chosen

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