cohosilver
Member
What is the maximum number of single pole 20 amp circuits on #12 awg THHN conductors (one hot, one neutral) that can be installed in a 3/4" EMT conduit and still meet the requirements of the NEC? At what number of circuits, or conductors, will it be either required to; reduce the overcurrent protection device from 20 amp single pole circuit breakers to less than 20 amps, increase the number of conduits to be installed, or increase the awg wire size from #12 THHN to #10 THHN?
Background: The conduits are installed indoors in a temperature controlled enviroment. The circuits are general purpose receptacle circuits, general lighting circuits. Ambient temperature factors or correctional factors for temperature are not applicable in this question. The calculated load or load on the circuit breakers are not factors in this equation, it is anticipated that the actual load demand will be small, the circuits are for general flourescent strip lighting and general office use such as desktop computers and an occassional printer.
Is a grounded conductor "neutral" in a single-phase two wire circuit consisting of one ungrounded conductor and one grounded conductor always considered a current carrying conductor for the purposes of ampacity adjustment factors?
Is there an NEC code reference that states that in a single-phase two wire circuit consisting of one ungrounded conductor and one grounded conductior that the grounded conductor is considered a current carrying conductor?
In the questions submitted, is the type voltage relevant such as 120/208V or 120/240V?
Background: The conduits are installed indoors in a temperature controlled enviroment. The circuits are general purpose receptacle circuits, general lighting circuits. Ambient temperature factors or correctional factors for temperature are not applicable in this question. The calculated load or load on the circuit breakers are not factors in this equation, it is anticipated that the actual load demand will be small, the circuits are for general flourescent strip lighting and general office use such as desktop computers and an occassional printer.
Is a grounded conductor "neutral" in a single-phase two wire circuit consisting of one ungrounded conductor and one grounded conductor always considered a current carrying conductor for the purposes of ampacity adjustment factors?
Is there an NEC code reference that states that in a single-phase two wire circuit consisting of one ungrounded conductor and one grounded conductior that the grounded conductor is considered a current carrying conductor?
In the questions submitted, is the type voltage relevant such as 120/208V or 120/240V?