Forum: Electrical Calculations / Engineering

My question pertains to the sections required in a generator switchboard which feeds Life Safety, Critical, Fire Pump and Equipment loads. I know...

How would you calculate a service for a 60ft x 150 ft manufactured building used for aquaculture reseqarch? I have not been givien a equipment...

All FPN at the end of NEC 310.13 states that "thermoplastic insulation where used on dc circuits in wet locations may result in electroendosmosis...

I installed some w.a.c l.e.d lighting in a cove and the afci breaker will trip anywhere from 10 minutes to 25 minutes after they are turned on. I...

Hope all is well with everyone. Am I to take 'acute care facility' to mean any clinic at all or is there a solid definition somewhere? I'm looking...

What is the effect called if just a hot conductor is run by itself in a conduit? By running a neutral or a ground it will cancel out this effect?...

I had a question thrown at me today concerning a 120V 1 1/2 HP singlephase motor running at 20 amps. The nuetral at the contactor for the motor is...

UL 924A is a standard that allows for the emergency lighting inverter to be installed with a 15min. battery run time, however with building codes and...

Hi again everyone, I posted a topic a while back when I started design for this covered RV storage, just finishing the design up now. The...

a store with outside demensions 50ft by 160 ft supplied by a 208y/120 volt 3 phase 4 wire with the following equipment 2 split system hvac...

I was on a job as a rep for the ATS manufacturer along with the reps for the genset and UPS. Contractor was cutting over a second MSB and we were to...

Medical office building, 6 stories. I have (2) set of emergency panels, transformers located on 2nd and 5th floor. The one on 2nd floor will serve...

Hi, I have a 15kV Transformer and is planning to perform DC HiPot test on the bushings. What is the maximum voltage that can be applied and to...

Would anybody please guide me to any/all applicable codes to be considered in doing electrical systems design for a operating room in a hospital in...

Checking out a small, 3 hp, approx 2"x18", centrifical fan that a customer wants to use for moving a reclaimed flour like substance. Using a new...

Does anyone have any ideas on who does Arc Flash Analysis in north N.J ?

I'm interesting in taking these exams....was wondering if I could sit for them without meeting licensing requirements?? I live in the NYC area. ...

Hey there, Just got my first commercial job. I'm a full time residential electrician so I'm not %100 on commercial code. the building is 2 stories...