§ 152.51 CALCULATION OF SERVICE LOAD FOR CERTAIN SIZE DWELLINGS.

   (A)   This calculation for a 1,500-square-foot dwelling shall be made as follows.

General lighting load 1500 square feet by 3   =   4500 watts

4500 - 115 volts         =   39.l amperes
(3-15 amp circuits)

Allowance for two appliance circuits   =   3000 watts
(2 circuits-20 amps)

Laundry circuit NEC 220-3(a)      =   1500 watts
(l circuit-20 amps)

Net total      =   9000 watts

   (B)   (1)   Feeder demand factors.

First 3000 watts at 100%      =   3000 watts

Remainder 6000 watts at 35%   =   2100 watts

Net total      =   5100 watts

12 kw range load (NEC Table 220-19)      =   8000 watts

Net load with range         =   13,100 watts

Utility installed 115/230 volt three-wire service.

      (2)   Example:

13,100 watts - 230 volts = amperes

NEC Section 230-41(b)(2) Net computed load exceeds 10 kw, so service conductors shall be at 100 amperes.

(Prior Code, § 152.36)