Answer / vipul parmar

STC Means Short time current. it s calculated from transformer Impedance.
there are difference stc rating like 18.3ka ,26.3ka ,31.4ka ,40ka.
Electrical Power Systems in industrial plants are designated to serve loads in a
safe and reliable manner. One of the major considerations in the design of a
power system is adequate control of short circuits.
Three-phase short circuits usually produce the highest magnitude of current the
power system equipment must be able to withstand. Phase to ground short
circuit currents might occasionally be higher than three-phase short circuits
currents in systems with multiple-point solid neutral grounding. In general,
power systems in industrial facilities, which employ single-point solid grounding
or resistance grounding, require only a three phase fault current calculation to
determine current magnitudes for proper fault interrupter application and for
protective device coordination studies. However, this study considers also the,
phase to phase, phase to ground and phase to phase to ground short circuit as a
reference.

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Before i went to bed my master bathroom lights were working fine. At 2 am, when I went to use the lights, none of them were working. The outlets throughout the bathroom work, but the lights and fan above the toilet don't. I have two panels of switches. The one panel has four switches. One of the switches turns on the hall light, and that works. The other three are to other lights, and they don't. The other panel has three switches. One of those is to the fan, and the other is to a light above the toilet. The other is a to light that is also on that other panel. I tried the breakers, and the one that turns off the outlets, marked for the bathrooom, turns on and off the outlets. None seemed to be tripped. I checked the lightbulbs, and they are fine. Please help

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if two transformers are placed parallel & both have fault impedance of 50KA will it increase or decrease show example?

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