 Re: 2391 practical
yes, I do see what you mean, but my old meter gives me Z between live and phase, as well as Ze so usually just calculate it. Maybe on the next try I'll use the meter they supply as I noted it did pscc and pefc.
Do you need Zs at the actual sub board? Or do you put the Ze for the main board into the schedule of test results for the 2nd board? To me it would seem much more logical to take another Ze at the sub board, as you could in a real situation have a long run of cable between the two, and that could make a significant difference to disconnection times. And for the sub main, the connection cable between the two would be part of the external
impedance loop. Am I right?
And thanks again. |