Following are the Typical safe ability of Transformer, Generator and Cable to withstand Isc – short circuit fault current in multiple of its In – rated current, without damage to the equipment.
| Device / Equipment | Isc Fault Current as multiple of In | Safe Withstand Duration without damage |
|---|---|---|
| Transformer | Isc = 25 x In | 300 Sec |
| Generator | Isc = 30 x In | 5 Sec |
| Cable | Isc = 25 x In | 1000 Sec |
Highest Prospective Short Circuit Current which a typical Generator can feed in case of of Short Circuit fault for Individual and Multiple Generators.
I2t – Let through Energy is available thermal energy resulting from Current Flow during circuit opening. I2t (of circuit breaker) < K2S2 (of cable)
Protection degree provided by Assembly against ingress of solid foreign particals and liquid is indicated by the IP code.
Temperature rise is defined as the average temperature rise of the ASSEMBLY above the Ambient Air Temperature, with Rated Current load for 8 hours.
Reference Ambient Air Temperature is one third (1/3) of sum of Maximum Air Temperature “Current + Daily Average + Annual Average + 10°C”. As per IS 9676.
Lightning is electrostatic discharge, causing the instantaneous release of energy. SPD diverts surge to ground without impacting utility supply.
Internal Arc Protection ensures Personal and ASSEMBLY protection under arcing conditions due to low impedance path, cause of electrical explosion.
Protection degree provided by Assembly against mechnical impact, according to IEC 62262, is defined by IK code.
Switchboard ASSEMBLY Base Frame Provides Base support to Assembly structure and evenly pass load onto base concrete foundation.