Whole house main connection

[stew]

I have an application for an 28 kw gen set. The existing installation has a large Milbank meter can 15x i think 24. This is mounted on the detached garage which has a 200 amp panel. The house is located on a side hill above the garage about 50 ft to the house panel also 200 amp size. It was originally fed separately and both buildings have a meter. The pud remove the 2nd service meter on the house and just jumpered the meter and blanked it off.
They then just took that initial service feeder and spliced it in the big meter can
Can I just make.my splice in the met
ter can to feed both ? Or do i have to use the garage panel as the splice point.? Garage panel is back to back on the service meter can inside.

 

[stew]

18 kw not 28

 

[stew]

The house is only 1400 sq ft and the garage area doesn't even need emergency power
.load calc on the house is only around 15 k max so that's the only load that will be on the generator.

 

[pipe_bender]

The existing installation has a large Milbank meter can 15x i think 24. This is mounted on the detached garage which has a 200 amp panel. The house is located on a side hill above the garage about 50 ft to the house panel also 200 amp size. It was originally fed separately and both buildings have a meter. The pud remove the 2nd service meter on the house and just jumpered the meter and blanked it off.

What you have now is unfused conductors between the garage and the house tapped off a garage meter can, these are 'service conductors'.
An ATS needs to replace a service disconnect, so youd be better off putting all this at the house.
If you intercept the service conductors feeding the house at the garage as you mention then you'll need to group the new service disconnect (the ATS) with the garage one and run a 4-wire feeder to the house. I don't know the exact code sections so perhaps someone else will correct me if I am wrong.