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### Help Support Professional Engineer & PE Exam Forum:

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1. ### NEC Code 430.22

When we size the conductor for a single motor, do we always assume it is continuous duty and multiply full load amp by 125% even if the question does not call out continuous duty?
2. ### Differential Relay CT Question

The question is about differential relay on a delta-wye transformer. I understand that the CTs need to be wye delta configuration to fix the phase shift. Therefore the CT secondary side current should be multiplied by sq root of 3 to get the relay current. On this PPI practice question the...
3. ### NCEES Practice Exam #12

The answer key says A,B,D so that's wrong right? A is incorrect but B and D are?
4. ### NCEES Practice Exam #12

Why is the zero-sequence current phasor equal in magnitude and displaced by 120 degree? Shouldn't it be same as zero-sequence for voltage phasors which are same in magnitude and in phase? Thank you in advance
5. ### NCEES practice exam #11

Could someone please explain to me why the solution is calculating Van phase voltage using Wye connected formula? Isn't VAB=12.5KV the phase voltage for the delta connection?? Much appreciated