ukgraduate
Electrical
- Sep 15, 2011
- 30
Hello,
Does anyone know if the NEC/NFPA allows:
1) The use of a 4 core cable for a 3 phase supply (such as a motor) and use the 4th (unused core) as the earth. (i.e full sized earth). The 4core, which is usually white will be taped green for identification.
2) The use of Steel Wire Armour cable as a means of mechanical protection for installations .i.e Cable is run inside a cable ladder for protection, however when it drop down to the motor the only mechanical protection shall be via the SWA of the cable.
Regards
UkGrad
Does anyone know if the NEC/NFPA allows:
1) The use of a 4 core cable for a 3 phase supply (such as a motor) and use the 4th (unused core) as the earth. (i.e full sized earth). The 4core, which is usually white will be taped green for identification.
2) The use of Steel Wire Armour cable as a means of mechanical protection for installations .i.e Cable is run inside a cable ladder for protection, however when it drop down to the motor the only mechanical protection shall be via the SWA of the cable.
Regards
UkGrad