Replacing old fused disconnects with standalone breaker, any suggestions?

[Usama]

Hi All,

Looking to replace old fused disconnects with breakers. I'm think of doing standalone 3PH breakers replacing to replace each disconnect. Space is limited, any suggestions on a product (Schneider, Eaton, GE) need both 100A and 200A frames.

Thanks in advance.

 

[Elect117]

1) Are those feeders or service disconnects?
2) Are these feeding dwelling units?
3) Do the the feeder terminations at their respective panelboards or loads have a MCB or local disconnecting means?
4) Are the meters customer owned or utility owned?

Aside from the possible code issues, if one tenet overloads the circuit then you will get multiple tenants without power rather than them tripping their own OCPD. You also have an odd number of sections. 3 disconnects, another 3, then 4 which means you will have 1 outlier on a 3ph circuit. Unless these are all 3ph fused disconnects.

 

[Usama]

1) Are those feeders or service disconnects?
2) Are these feeding dwelling units?
3) Do the the feeder terminations at their respective panelboards or loads have a MCB or local disconnecting means?
4) Are the meters customer owned or utility owned?

Aside from the possible code issues, if one tenet overloads the circuit then you will get multiple tenants without power rather than them tripping their own OCPD. You also have an odd number of sections. 3 disconnects, another 3, then 4 which means you will have 1 outlier on a 3ph circuit. Unless these are all 3ph fused disconnects.

1) They're feeder disconnects. These are fed of a main switchboard located else where on the property.
2) They're feeding dwelling units.
3) Unsure if the downstream panels have a line side disconnect switch.
4) the meters are utility owned.

Each fused disconnect is 3Ph (according to the existing as-bults).

 

[kwired]

Each fused disconnect is 3Ph (according to the existing as-bults).

Might want to double check something tells me they could be three pole switches but might be switching neutral with one pole? Hopefully no fuse in the neutral if that is the case.

 

[Elect117]

1) They're feeder disconnects. These are fed of a main switchboard located else where on the property.
2) They're feeding dwelling units.
3) Unsure if the downstream panels have a line side disconnect switch.
4) the meters are utility owned.

Each fused disconnect is 3Ph (according to the existing as-bults).

Next you will need to figure out what the available fault current is or the SCCR of the main, if they are using feeder taps, the wire sizes of said taps, the OCPDs needed for the taps, and make sure each unit has Overvoltage / surge protection on the feeder.

You should verify the derating in conduit and possibly load calc. But the load calc is probably unnecessary if you are matching the OCPD that is existing.

Lastly, I am guessing, that each D/C will need to be lockable in the off position for the utility to turn each service / meter off. But that you can verify with them. That is just a common requirement.