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  1. BrianEngPME

    code question: CT allowed inside disconnect?

    Hello, Code question! Is a current transformer (CT) allowed inside a fused disconnect/fused safety switch? Seems like the NEC doesn't say... I've looked in article 312 and article 404. Also, if the CT is allowed inside the FSS, would a tap for the voltage (for a power meter) also be allowed...
  2. BrianEngPME

    VFD for pump

    Hello, I am an engineer w/mechanical & electrical background, reviewing a VFD submittal for some pumps. The VFD the contractor is proposing doesn't meet the specs, and I was wondering if anyone could tell me how important it is to have the ability to produce a lot of torque in order to get the...
  3. BrianEngPME

    Calculating Effective Projected Area (EPA)

    thread659-77494 To calculate the Effective Projected Area (EPA) for situations like outdoor lighting (involving fixtures and poles) it's a function of both the projected area AND the drag coefficient. Check out this literature from GE...

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