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 |
|
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 |
|
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
- Article 200 Use and Identification of Grounded Conductors
- Article 210 Branch Circuits
- Article 215 Feeders
- Article 220 Branch-Circuit, Feeder, and Service Calculations
- Article 225 Outside Branch Circuits and Feeders
- Article 230 Services
- Article 240 Overcurrent Protection
- Article 250 Grounding and Bonding
- Article 280 Surge Arresters
- Article 285 Transient Voltage Surge Suppressors (TVSSs)
Wiring Methods and Materials
- Article 300: Wiring Methods
- Article 310 Conductors for General Wiring
- Article 312 Cabinets, Cutout Boxes, and Meter Socket Enclosures
- Article 314 Outlet, Device, Pull, and Junction Boxes; Conduit Bodies; Fittings; and Handhole Enclosures
- Article 320 Armored Cable Type AC
- Article 322 Flat Cable Assemblies Type FC
- Article 324 Flat Conductor Cable Type FCC
- Article 326 Integrated Gas Spacer Cable Type IGS
- Article 328 Medium-Voltage Cable Type MV
- Article 330 Metal-Clad Cable Type MC
- Article 332 Mineral-Insulated, Metal-Sheathed Cable Type MI
- Article 334 Nonmetallic-Sheathed Cable Types NM, NMC, and NMS
- Article 336 Power and Control Tray Cable Type TC
- Article 338 Service-Entrance Cable Types SE and USE
- Article 340 Underground Feeder and Branch-Circuit Cable Type UF
- Article 342 Intermediate Metal Conduit Type IMC
- Article 344 Rigid Metal Conduit Type RMC
- Article 348 Flexible Metal Conduit Type FMC
- Article 350 Liquidtight Flexible Metal Conduit Type LFMC
- Article 352 Rigid Nonmetallic Conduit Type RNC
- Article 353 High Density Polyethylene Conduit Type HDPE Conduit
- Article 354 Nonmetallic Underground Conduit with Conductors Type NUCC
- Article 356 Liquidtight Flexible Nonmetallic Conduit Type LFNC
- Article 358 Electrical Metallic Tubing Type EMT
- Article 360 Flexible Metallic Tubing Type FMT
- Article 362 Electrical Nonmetallic Tubing Type ENT
- Article 366 Auxiliary Gutters
- Article 374 Cellular Metal Floor Raceways
- Article 382 Nonmetallic Extensions
- Article 384 Strut-Type Channel Raceway
- Article 386 Surface Metal Raceways
- Article 388 Surface Nonmetallic Raceways
- Article 390 Underfloor Raceways
- Article 392 Cable Trays
- Article 394 Concealed Knob-and-Tube Wiring
- Article 396 Messenger Supported Wiring
- Article 398 Open Wiring on Insulators
Equipment for General Use
- Article 400: Flexible Cords and Cables
- Article 402: Fixture Wires
- Article 404: Switches
- Article 406: Receptacles, Cord Connectors, and Attachment Plugs (Caps)
- Article 408: Switchboards and Panelboards
- Article 409: Industrial Control Panels
- Article 410: Luminaires (Lighting Fixtures), Lampholders, and Lamps
- Article 411: Lighting Systems Operating at 30 Volts or Less
- Article 422: Appliances
- Article 424: Fixed Electric Space Heating Equipment
- Article 426: Fixed Outdoor Electric De-Icing and Snow-Melting Equipment
- Article 427: Fixed Electric Heating Equipment for Pipelines and Vessels
- Article 430: Motors, Motor Circuits, and Controllers
- Article 440: Air Conditioning and Refrigerating Equipment
Special Occupancies
- Article 500 Hazardous (Classified) Locations, Classes I, II, and III, Divisions 1 and 2
- Article 501 Class I Locations
- Article 502 Class II Locations
- Article 503 Class III Locations
- Article 504 Intrinsically Safe Systems
Special Equipment
Special Conditions
- Article 700 Emergency Systems
- Article 701 Legally Required Standby Systems
- Article 702 Optional Standby Systems
Tables
- Tables
- Notes to Tables
- Tables 11(A) and 11(B)
- Notes for Tables 11(A) and 11(B)
- Tables 12(A) and 12(B)
- Notes for Tables 12(A) and 12(B)
Annex C. Conduit and Tubing Fill Tables for Conductors and Fixture Wires of the Same Size
Annex D. Examples
- Annex D. Examples
- Example No. D1(a) One-Family Dwelling
- Example No. D1(b) One-Family Dwelling
- Example No. D2(a) Optional Calculation for One-Family Dwelling Heating Larger than Air Conditioning [See Section 220.82]
- Example No. D2(b) Optional Calculation for One-Family Dwelling, Air Conditioning Larger than Heating [See 220.82(A) and 220.82(C)]
- Example No. D2(c) Optional Calculation for One-Family Dwelling with Heat Pump(Single-Phase, 240/120-Volt Service) (See 220.82)
- Example No. D3 Store Building
- Example D3(a) Industrial Feeders in a Common Raceway
- Example No. D4(a) Multifamily Dwelling
- Example No. D4(b) Optional Calculation for Multifamily Dwelling
- Example No. D5(a) Multifamily Dwelling Served at 208Y/120 Volts, Three Phase
- Example No. D5(b) Optional Calculation for Multifamily Dwelling Served at 208Y/120 Volts, Three Phase
- Example No. D6 Maximum Demand for Range Loads
- Example No. D8 Motor Circuit Conductors, Overload Protection, and Short-Circuit and Ground-Fault Protection
- Example No. D9 Feeder Ampacity Determination for Generator Field Control
- Example No. D10 Feeder Ampacity Determination for Adjustable-Speed Drive Control [See 215.2, 430.24, 620.13, 620.14, 620.61, Tables 430.22(E), and 620.14]
- Example No. D11 Mobile Home (See 550.18)
- Example No. D12 Park Trailer (See 552.47)
Annex E. Types of Construction
Pocket Guide to the National Electrical Code(R), 2005 Edition (8th Edition)
ISBN: 0131480014
EAN: 2147483647
EAN: 2147483647
Year: 2004
Pages: 120
Pages: 120
Authors: Marvin J. Fischer
