multi family dwelling

[cdwelectric]

I am a contractor in Michigan, I have two questions for discussion.
The project is a 22 unit apartment complex built in the mid 1920's and is need of a service change.
question #1 is the house panel load calculated the same as each apartment
for example each apartment general lighting load is 3 va per
sq. ft. ---- hallways, basement, storage rooms, are
all on the house panel, plus perimeter lighting, 4 gas dryers, and
4 cloths washers
question #2 They also want to calculate for adding fixed electric heat in the
future, in western Michigan, I wonder what the formula for
electric heat would be, x amount of watts per sq. ft. or a
certain amount of Btu's ?

 

[bob]

question #1 is the house panel load calculated the same as each apartment
for example each apartment general lighting load is 3 va per
sq. ft. ---- hallways, basement, storage rooms, are
all on the house panel, plus perimeter lighting, 4 gas dryers, and
4 cloths washers?

Not necessarily. Many time the house load consists of only exterior lighting.
You need to size according to the load. From your information you need the
minimum of a 100 amp panel, depending on the number of dryers and washing machines.
Do the load calculations per 220.

question #2 They also want to calculate for adding fixed electric heat in the
future, in western Michigan, I wonder what the formula for
electric heat would be, x amount of watts per sq. ft. or a
certain amount of Btu's ?

They should provide the size of the electrical heaters. There are some sqft
estimates but you need the actual load. In that part of the country you won't
get much reduction in the total heat load for your circuits. Generally 100%.
When one of those "noreasters" comes in everybody's heat will be on.