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  • Users: hhsting
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  1. hhsting

    Motor contributions

    I have project its high rise building where the electrical designer provided motor contributions estimates with shirt circuit study for 240V single phase hvac motors. All combined hvac motors of all the units makes difference. Their is also elevator motors 50hp, 30hp at 208V three phase. The...
  2. hhsting

    Sprinkler heat trace

    I have sprinkler pipe in church garage setting. The sprinkler pipe has heat trace. Does the circuit for sprinkler pipe require ground fault protection of equipment (GFPE) or not according to NEC?
  3. hhsting

    NFA 20 2013

    I have dedicated utility service that feed service rated fire pump controller to fire pump 100 HP, 480V, three phase. I need to know the circuit breaker internal in the fire pump controller trip rating so I can size equipment grounding conductor between the controller and fire pump NEC 2014...
  4. hhsting

    wye to wye transformer grounding

    I have customer owned 2000kva transformer wye to wye primary 13.2kv to secondary 600V used for solar farm. The transformer primary is fed from customer owned 13.2kV SWBD. The service point as defined in NEC 2014 is at 13.2kV Swbd which has fused disconnect to the transformer. I have 3...

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