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[Music] it is a common practice for electricians to install additional conductors into a conduit raceway system that may already contain conductors to determine the total number of conductors permitted in a conduit apply the following steps step one determine the conductor fill of the conduit the conductor fill is the maximum area that can be occupied by conductors and is typically forty percent of the cross sectional area of the conduit this leaves sixty percent of the conduit unavailable for use if the conduit being used is one and a half inch emt per table four in the nec forty percent of the cross sectional area of one and a half inch emt containing more than two conductors equals 0.814 square inches step two determine the cross-sectional area of the existing conductors per table 5 in the nec the cross-sectional area of a number 8 t-h-h-n conductor equals 0.0366 square inches if 10 number 8 t-h-h-n conductors are in a conduit then the cross-sectional area of the existing conductor
