552-Park Trailers: Page 8 of 14

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rating in accordance with (a) through (d).
FPN No. 1: For the laundry branch circuit, see 210.11(C)(2). FPN No. 2: For central air conditioning, see Article 440.

(a) The total rating of fixed appliances shall not exceed 50 percent of the circuit rating if lighting outlets, general-use receptacles, or both are also supplied.

(b) For fixed appliances with a motor(s) larger than

'/« horsepower, the total calculated load shall be based
on 125 percent of the largest motor plus the sum of the
other loads. Where a branch circuit supplies continuous
load(s) or any combination of continuous and
noncontinuous loads, the branch-circuit conductor size
shall be in accordance with 210.19(A).

(c) The rating of a single cord-and-plug-connected appliance supplied by other than an individual branch circuit shall not exceed 80 percent of the circuit rating.

(d) The rating of a range branch circuit shall be based on the range demand as specified for ranges in

552.47(B)(5).

552.47 Calculations. The following method shall be em- ployed in computing the supply-cord and distribution- panelboard load for each feeder assembly for each park trailer in lieu of the procedure shown in Article 220 and shall be based on a 3-wire, 208Y/l20-volt or 120/240- volt supply with 120-volt loads balanced between the two phases of the 3-wire system.

(A) Lighting and Small-Appliance Load. Lighting Volt- Amperes: Length times width of park trailer floor (out side dimensions) times 33 volt-amperes/m 2 (3 VA/ft 2). For example,
Length x width x 3 = lighting volt-amperes Small- Appliance Volt-Amperes: Number of circuits times 1500 volt-amperes for each 20-ampere appliance receptacle circuit (see definition of Appliance, Portable with fine print note) including 1500 volt-amperes for laundry circuit. For example,
No. of circuits x 1500 = small-appliance volt-amperes Total: Lighting volt-amperes plus small-appliance volt- amperes = total volt-amperes
First 3000 total volt-amperes at 100 percent plus re- mainder at 35 percent = volt-amperes to be divided by
240 volts to obtain current (amperes) per leg.

(B) Total Load for Determining Power Supply. Total load for determining power supply is the sum of the following:

(1) Lighting and small-appliance load as calculated in

552.47(A).
Nameplate amperes for motors and heater loads (exhaust fans, air conditioners, electric, gas, or oil heating). Omit smaller of the heating and cooling
loads, except include blower motor if used as air- conditioner evaporator motor. Where an air conditioner is not installed and a 50-ampere power- supply cord is provided, allow 15 amperes per phase for air conditioning.

(3) Twenty-five percent of current of largest motor in

(B)(2).

(4) Total of nameplate amperes for disposal, dishwasher, water heater, clothes dryer, wall- mounted oven, cooking units. Where the number of these appliances exceeds three, use 75 percent of total.

(5) Derive amperes for freestanding range (as distin- guished from separate ovens and cooking units) by dividing the following values by 240 volts:

Nameplate Rating (watts) Use (volt-amperes)
0-10,000 80 percent of rating
Over 10,000-12,500 8,000
Over 12,500-13,500 8,400
Over 13,500-14,500 8,800
Over 14,500-15,500 9,200
Over 15,500-16,500 9,600
Over 16,500-17,500 10,000
(6) If outlets or circuits are provided for