multi family condo conversion: upgrade the new subfeed to 100a or can it stay 60a

[wyreman]

Residential question:
Existing 200a four meter bank [3unit and house] has four discos rated 60a each.
My unit will have all existing k&t abandoned.
I will pull a new distribution up to the middle of the unit.
Load calcs read 41a
1575 ft^2 unit with not much power usage.

Do I have to upgrade the new subfeed to 100a or can it persist as 60a?
local codes may apply i will get with the ahj today @330p
thx!

 

[102 Inspector]

I am quessing that NEC 230.79(D) would be your code reference and would allow the smaller service for each unit.

 

[wyreman]

hey 102 you are the man!

(D) All Others. For all other installations, the service disconnecting means shall have a rating of not less than 60 amperes.

 

[GoldDigger]

Residential question:
Existing 200a four meter bank [3unit and house] has four discos rated 60a each.
My unit will have all existing k&t abandoned.
I will pull a new distribution up to the middle of the unit.
Load calcs read 41a
1575 ft^2 unit with not much power usage.

Do I have to upgrade the new subfeed to 100a or can it persist as 60a?
local codes may apply i will get with the ahj today @330p
thx!

Definitely look at local codes, in particular those which apply to rental housing, not just electrical codes.
Here is an example from the Port Huron code:
(underlining mine)

Housing
City of Port Huron
Page 4

4.8
Service and/or Feeder.
The service or feeder to an existing dwelling unit shall be a minimum of three-wire, one hundred ampere capacity.
Service equipment shall be dead front, having no live parts exposed whereby accidental contact could be made.
All plug type fuses shall be Type S.
Exception: An existing properly installed sixty ampere capacity, three wire service and feeders of thirty ampere, two-wire are acceptable if adequate for the load being served.

 

[mgookin]

What's the "conversion"?

Do you have a change in occupancy classification?