Power supply - motor029.html


4-conductor system, TN-C-S
		Protective earth conductor Protective earth terminal in enclosure (not totally insulated)
Overcurrent protective device is required in the supply for compliance to IEC/EN 60204-1

5-conductor system, TN-S supply system
		Protective earth conductor Protective earth terminal in enclosure (not totally insulated)
Overcurrent protective device is required in the supply for compliance to IEC/EN 60204-1


3-conductor system, IT supply system

Overcurrent protective device is required in the supply for compliance to IEC/EN 60204-1 For all systems: use the N conductor only with the agreement of the user

		Separate primary and secondary protection Earthed control circuit. In non-earthed control circuit, remove link and provide insulation monitoring.

		Combined primary and secondary protection Earthed control circuit. In non-earthed control circuit, remove link and provide insulation monitoring. Maximum ratio of U1/U2 = 1/1.73 Circuit not to be used with STI/STZ (safety and isolating transformers).