Electrical Computation for a Residential Building

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rojhan123

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Philippines
Good Day just need some help regarding the computation of main feeder and sub feeder of a 4 storey residential building. There are 3 floors to be utilized for dwelling units as the 1st floor will be utilized as rent-able space, each floor is divided into two feeders (19-units and the other one is composed 18-units) all units have identical loads which also consist of both electric cooking and air-conditioning units (approx. 5KVA per unit). Any suggestion on the proper approach of the computation?Thanks. or if you could provide a sample project with approximately similar scenarios just for my basis of computation it would great. And by the way the system will be 3 phase 230V.
 
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GoldDigger

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rojhan123 said:
... And by the way the system will be 3 phase 230V.
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Actually, it is extremely unlikely that you have three phase 230V for residential.

Much more likely would be three phase four wire 208Y/120, meaning that the three hot legs are all 120V to the neutral (very good for 120V lights and appliances) and between any two legs will be 208V (usually good enough for 240V motors and heating, although stoves, dryers, water heaters, etc. will not heat as fast as they would with single phase 120/240 three wire and some motors just might have problems.)
You can usually order heating appliances for 208V rather than 240 if performance is a major issue.
 
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rojhan123

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Philippines
tnx sir for the comments.,the units will be supplied with a single phase system L-L with 1-G for equipment grounding (115/230V) as that is the system we use here in the Philippines.,.now i am asking is the application of demand factors as that will det. the size of wire i will be using for my sub feeders.,and may i add up to my question what size of conductor should i use for this whole building if i use 2000A 3-pole as my main CB @ 115/230V system. should i be using parallel set of conductors for this?Thanks
 
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