Example No. D11 Mobile Home (See 550.18)

A mobile home floor is 70 ft. by 10 ft. and has two small appliance circuits; a 1000-VA, 240-V heater; a 200-VA, 120-V exhaust fan; a 400-VA, 120-V dishwasher; and a 7000-VA electric range.

Lighting and Small Appliance Load

Lighting (70 ft. x 10 ft. x 3 VA per ft.2)

2100 VA

Small appliance (1500 VA x 2 circuits)

3000 VA

Laundry (1500 VA x 1 circuit)

1500 VA

Subtotal

6600 VA

First 3000 VA at 100%

3000 VA

Remainder (6600 VA - 3000 VA) at 35%

1260 VA

Total

4260 VA

 
 

Amperes per Leg

 

Leg A

Leg B

Lighting and appliances

17.75

17.75

Heater (1000 VA ÷ 240 V)

4.20

4.20

Fan (200 VA x 125% ÷ 120 V)

2.08

Dishwasher (400 VA ÷ 120 V)

3.30

Range (7000 VA x 0.8 ÷ 240 V)

23.30

23.30

Total amperes per leg

47.33

48.55

Based on the higher current calculated for either leg, a minimum 50-A supply cord would be required.

For SI units, 0.093 m2 = 1 ft2 and 0.3048 m = 1 ft.





Pocket Guide to the National Electrical Code 2005
Pocket Guide to the National Electrical Code(R), 2005 Edition (8th Edition)
ISBN: 0131480014
EAN: 2147483647
Year: 2004
Pages: 120
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