Last Month there was a storm on Cape Cod MA, this caused wide spread power outages. As a result we where called in to tie in three 800 KW temporary generators into three separate supermarkets.
Each unit was a very new trailer mounted Caterpillar genset.
While making up the connections we could not help but notice this sticker.
Should we have packed up and gone home?
[This message has been edited by iwire (edited 01-01-2006).]
Bob Badger Construction & Maintenance Electrician Massachusetts
I would also never assume it. In my experience in my area this is what I have found. When it is "criticle" to acheive the requested ohms you should always measure it.
This isn't exactly on topic, but it's related to something I've always wondered:
It seems like everyone talks about earth impedence being less-than or equal-to 25 ohms. That doesn't really make sense to me. How can earth have a definite resistance? Your resistance has to be between two points on a circuit, and assuming the ground rod is A, where is B? And if you increase the distance between the two points aren't you increasing the resistance?
What's going on when people talk about "earth impedence?"