Recent content by Dolphin P.E.

KAIC standard depends on the manufacturer, for example 'Square D' has10K, 14K, 18K, 22K, 25K, 35K, 42K, 65K, 100K, and 200K just for 120/208V panelboards.

1) You haven't provide the voltage or the conduit type. Assuming the line voltage is 480V, and the wire runs in steel conduit. Short Circuit KVA for transformer = 100 / 0.02 = 5000 KVA Short Circuit for feeder = (480 * 480) / (1000 * 0.00275) = 83780 KVA (note: 0.00275 is the value of the 50ft...

Yes, there is. See NEC 310.13B, 310.13C, 310.13D, 310.13E. Let me know if it helps.

I agree.

NO, you are not the only one for sure!!

Be careful, too much details.

1. Kaplan Sample Exam, Camara's Sample exam, Camara's practice problems, Kaiser sample exam, 6 minute solutions. Problems from your reference manual. 2. I attemped to solve'm all. 3. Myself, I beleive you have to attempt to solve problems from various books, although NCEES is most important...

I had an educated guess on 6 problems, I managed to get 4 right. After all, I had about 5 minutes to spare in both morning and afternoon.

Me too, just received my wall certificate today.

I would have chosen an 'educated guess' method instead!

All I got is the wallet license card. No wall certificate yet.

I thought there is one dealing with speed regulation. Speed regulation in this case will be (1800-1725)/1725 = 4.34%

Yes, slip value should be computed from the Sync speed 1800rpm and the Full-load speed 1725rpm which is 4.2%

I would give it one more week.

This is my shot for this problem, approximate Values: FLA = 75000W/4000V/1.732 = 10.8A NLA is about 30% for big motors = 3A Starting current is about 5.7 times of the FLA = 62A Nominal speed = 900- (900*.02) = 880 rpm