Working on a proposal for an arc flash study.
I've noticed that a lot of the older GE transformers do not have the impedance on the label. What to do?
Also, what is the typical way to handle having multiple ways to configure a system? If there is a utility and a generator, I understand the energy should be calculated using each source, and the worse case used on the label.
But what happens when the options get crazy? For example, a system with 2 utility feeds, a generator, 3 UPS's 3 transfer switches, and tie breakers??
If I need to calculate it every which way, I'm sure the fault currents will be very low, and the breakers will trip very slowly, and everything is just going to be "dangerous".
I've noticed that a lot of the older GE transformers do not have the impedance on the label. What to do?
Also, what is the typical way to handle having multiple ways to configure a system? If there is a utility and a generator, I understand the energy should be calculated using each source, and the worse case used on the label.
But what happens when the options get crazy? For example, a system with 2 utility feeds, a generator, 3 UPS's 3 transfer switches, and tie breakers??
If I need to calculate it every which way, I'm sure the fault currents will be very low, and the breakers will trip very slowly, and everything is just going to be "dangerous".