Yes, they would not really limit current and the first fault cycle would still be full current, if the actual fault MVA is much below their rating and hence the need for testing the combination.
limiting short circuit current at chiller
- Thread starter malachi constant
- Start date
- Status
ptonsparky
Tom
- Occupation
- EC - retired
Timely discussion and frustrating as well. So much of the equipment we connect is supplied by others and we know nothing about it other than maybe the total hp or a max current . Little late in the process to see that equipment show up with a limit of 5K.
Worse is when I am responsible for all, and my current level is still at 5320 when done. Double dang.
Worse is when I am responsible for all, and my current level is still at 5320 when done. Double dang.
- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
When all else fails, divide by sqrt(3) and hope nobody notices.
ron
Senior Member
- Location
- New York, 40.7514,-73.9925
I recently worked on a project where I put an underrated piece of equipment on a punchlist for it to be replaced, and the EC said that he asked the inspector to look at it and the inspector said it was ok as it is.
I suspect the inspector didn't understand what he was looking at, or didn't really look at it carefully / or at all.
kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
I would say there is a chance the EC didn't understand either. He may not have specifically mentioned your concerns to inspector and figured if inspector didn't reject anything it is fine.
Even so if you are the designer, he should be installing to your design. Now if you changed that design in the middle of the project, I can understand him wanting extra for the changes, even if he doesn't understand why you want the change.
ron
Senior Member
- Location
- New York, 40.7514,-73.9925
Agreed. Luckily for me, I try to think about ratings before the project is bid, so no change order, just an arm wrestling match.
- Status