B
baldsparkies
Have been looking at a situation where a 400 amp MCCB is feeding a ups. There is a mains supply to a genny changeover switch, along with the genny supply, and the MCCB is between the genny switch and the UPS.
Yes its a big bu##er.
Any ways there was a momentary power fluctuation which threw the mccb, great because the change over would not have seen this, cus the main supply would still be on to it.
That meant the genny didnt kick in and walla a problem once the ups powered down.
Now my question, MCCB's are notorius as we know for kicking out when hit by surge current as probably happened here. All we needed to do was to re set the thing. but of course the damage is done by then.
What do you clever types think about replacing the MCCB with a 400 amp switchfuse with HRC links instead of the MCCB. Before you ask, the thing is dialled up to max, Load test shows 280 amps running full load.
I reckon its the best way forward but wanted to pick yer brains
The install is top notch. All composite panels, monitor equipment PFC installed, should be a dream if not for this one week link in the chain.
UPS supplys are all individual 150mm tri rated cables, so nice and bendy to work with.
Thanks for your input in advance.
Yes its a big bu##er.
Any ways there was a momentary power fluctuation which threw the mccb, great because the change over would not have seen this, cus the main supply would still be on to it.
That meant the genny didnt kick in and walla a problem once the ups powered down.
Now my question, MCCB's are notorius as we know for kicking out when hit by surge current as probably happened here. All we needed to do was to re set the thing. but of course the damage is done by then.
What do you clever types think about replacing the MCCB with a 400 amp switchfuse with HRC links instead of the MCCB. Before you ask, the thing is dialled up to max, Load test shows 280 amps running full load.
I reckon its the best way forward but wanted to pick yer brains
The install is top notch. All composite panels, monitor equipment PFC installed, should be a dream if not for this one week link in the chain.
UPS supplys are all individual 150mm tri rated cables, so nice and bendy to work with.
Thanks for your input in advance.