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[MBLES]

The engineer supplied 2 calculations for afci.

The following data was obtained from ABC ELECTRIC on their 50KVA transformer:
a. Fault Current at the secondary of the 50KVA transformer = 19,768Amps.
ABC Engineering: calculated the Short-Circuit Fault Current at Panel "P".:
b. Calculated Fault Current at Panel “P” = 17,395Amps.
The Point to Point Method of Short-Circuit calculations was used to performed the
Fault Current Study calculation s at Panel "P"

Do both calculation go on service equipment? one on meter other on disconnect? or just disconnect? The service is an exisiting 6 gang meter bank. Our service is the last to be installed and will have the label. I am not sure where the label is going.

 

[kwired]

The engineer supplied 2 calculations for afci.

The following data was obtained from ABC ELECTRIC on their 50KVA transformer:
a. Fault Current at the secondary of the 50KVA transformer = 19,768Amps.
ABC Engineering: calculated the Short-Circuit Fault Current at Panel "P".:
b. Calculated Fault Current at Panel “P” = 17,395Amps.
The Point to Point Method of Short-Circuit calculations was used to performed the
Fault Current Study calculation s at Panel "P"

Do both calculation go on service equipment? one on meter other on disconnect? or just disconnect? The service is an exisiting 6 gang meter bank. Our service is the last to be installed and will have the label. I am not sure where the label is going.

Panel "P" is where 17,395 amps of fault current is determined to be available.

19,768 at the transformer only means something to you if you are calculating something further downstream from that point. The impedance of conductors between the transformer and panel "P" reduces the current during a fault at panel "P" to only 17,395 amps.

Is your equipment panel "P"? If you are actually down stream from panel "P" then your equipment will have even less available fault current how much less depends on type, size and length of conductors between them.