HQP breakers are a pain, they have virtually no fuse series rating except for class T...The excerpt you provided does not show any series rating with Class J fuses. Every line with HQP in column 4 has Class T in column 2.
Cheers, Wayne
Do you need 100k? There are more options at 65k, where you can rate with a class L, R or J in addition to T
Can you go to a breaker upstream? With upstream breaker your choices expand dramatically with up to a 1200 amp device at 100k or even 400 amp device at 200k
Thanks but why is this a solution? I already have a switchboard feeding the meter bank shown on the drawing. A vacubreak switch is feeding the meter bank. The vacubreak switch can hold class T fusesWS3600CU is your solution.
I see, You have 600A in the switchboard.Thanks but why is this a solution? I already have a switchboard feeding the meter bank shown on the drawing. A vacubreak switch is feeding the meter bank. The vacubreak switch can hold class T fuses
I've seen a lot of those siemens meter banks in NYC and I have a feeling people don't do any short circuit calculations or series ratings. People simply don't care or don't know how to do it.I see, You have 600A in the switchboard.
Then if you can have class T in your vacubreak switch, you already have solution.
I don't know how often you see class T fuse in vacubreak switch?
At least meter bank with fuse switch is a type of solution i have seen many time.
Maybe you can try it.
I've seen a lot of those siemens meter banks in NYC and I have a feeling people don't do any short circuit calculations or series ratings. People simply don't care or don't know how to do it.
That is one reason you need to conduct the coordination study, isn't it?The only issue I have with using class T fuses is that they might not coordinate well with HQS and HQP breakers. So if there is a short circuit downstream of the HQS or HQP breaker, the main 600 amp class T fuse might trip.
Coordination is not required in some circumstances, but it is highly sought out.If nobody check it, then they don't care.
But if there is a EOR, then they know what to do.
That is one reason you need to conduct the coordination study, isn't it?
To ensure that equipment is installed correctly, a power system study is important.
I mean in your case, If it is not required, then why do you worry if class T does not coordinate with HQS and HQP.Coordination is not required in some circumstances, but it is highly sought out.
Cause the 600 amp class T fuse feeds 15 apartments. If there is a short circuit in one of the apartments and the class T fuse blows, good luck to the contractor finding out where the fault came from.I mean in your case, If it is not required, then why do you worry if class T does not coordinate with HQS and HQP.
I don't think they care much about this.Cause the 600 amp class T fuse feeds 15 apartments. If there is a short circuit in one of the apartments and the class T fuse blows, good luck to the contractor finding out where the fault came from.
The meter bank does not exist yet I'm specifying it. Here's what I am proposing:Does the meter bank already exist? If not, I wonder if you can order it to take bqd breakers since they series rate with J. If it already exists, maybe you'll get lucky and can change the fingers out for BQD fingers?
The contractor might not care cause it's $$$ for them. But think about the power downtime for the 15 apartments figuring out where the fault came from.I don't think they care much about this.
However, I am not a contractor. Let's wait for the contractor's response.
It's too bad they don't give you that option. Then why not go with just all qs tenant breakers?The meter bank does not exist yet I'm specifying it. Here's what I am proposing:
https://support.industry.siemens.co...NYC_Metering_SelectionandApplicationGuide.pdf
According to the cutsheet you can't use BQD breakers on the meter bank
I don't think it is hard to find out.The contractor might not care cause it's $$$ for them. But think about the power downtime for the 15 apartments figuring out where the fault came from.
Cause I am refeeding apartments that are fed by 60 amp breakers. New meter bank will be installed with 60 amp breakers, apartments can upgrade if they want for future.It's too bad they don't give you that option. Then why not go with just all qs tenant breakers?