Either 60601-1:1988 or 60601-1: 2005 states that a current of 25 A or 1.5 times the highest RATED current of the relevant circuit, whichever is greater, shall be used to check the earth impedance.
What is highest RATED current of the relevant circuit? Whether it means the rated current of overcurrent protective device (e.g. circuit breaker)?
For our three-phase equipment (line-to-line voltage: 415V), a circuit breaker rated at 32A used. But the rating power input is 15kVA, that said the rating current for a phase is about 21A. I am confused that which current (32A or 21A) shall be considered as the basis (multiplied by 1.5) of the earth impedance test?
Please kindly share your view. Thanks
What is highest RATED current of the relevant circuit? Whether it means the rated current of overcurrent protective device (e.g. circuit breaker)?
For our three-phase equipment (line-to-line voltage: 415V), a circuit breaker rated at 32A used. But the rating power input is 15kVA, that said the rating current for a phase is about 21A. I am confused that which current (32A or 21A) shall be considered as the basis (multiplied by 1.5) of the earth impedance test?
Please kindly share your view. Thanks