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.

Article 90 Introduction

General

Wiring and Protection

Wiring Methods and Materials

Equipment for General Use

Special Occupancies

Special Equipment

Special Conditions

Tables

Annex C. Conduit and Tubing Fill Tables for Conductors and Fixture Wires of the Same Size

Annex D. Examples

Annex E. Types of Construction



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

Flylib.com © 2008-2017.
If you may any questions please contact us: flylib@qtcs.net