Indiana Administrative Code › Title 675 - FIRE PREVENTION AND BUILDING SAFETY COMMISSION › Article 15 - INDUSTRIALIZED BUILDING SYSTEMS › Rule 2 - Indiana Mobile Structures Code › Section 2-100 - Load calculations

Current through July 10, 2024
Authority: IC 22-13-2-13
Affected: IC 22-12; IC 22-13; IC 22-14; IC 22-15
Sec. 100.
(a) The
				following method shall be employed in computing the supply cord and
				distribution panelboard load for each feeder assembly for each mobile structure
				and shall be based on a three (3) wire, one hundred fifteen/two hundred thirty
				(115/230) volt supply with one hundred fifteen (115) volt loads balanced
				between the two (2) legs of the three (3) wire system.
(1) ) Method No. 1; Lighting and Small
				Appliance Load. Lighting Watts: Length times width of mobile structure (outside
				dimensions, exclusive of coupler) times three (3) watts per square foot; e.g.,
				Length × Width × 3 = _____ lighting watts. Small Appliance Watts:
				Number of circuits times one thousand five hundred (1500) volt amperes for each
				twenty (20) ampere appliance receptacle circuit (see definition of "appliance,
				small" with note); e.g., Number of circuits × 1500 = _____ small
				appliance volt-amperes.
Total lighting watts plus small appliance = _____ total
				  volt-amperes.
First three thousand (3000) total volt-amperes at one hundred
				  percent (100) plus remainder at thirty-five percent
(35%) = _____ volt-amperes to be divided by two hundred
				  thirty (230) volts to obtain current (amperes) per leg.
Total load for determining power supply is the summation of:
(A) Lighting and small appliance load
				is calculated in (a)(1).
(B)
				Nameplate amperes for motors and heater loads (exhaust fans*, air
				conditioners*, electric gas, or oil heating.+)
*Omit smaller of these two (2), except include blower motor
				  if used as air-conditioner evaporator motor.
+When an air conditioner is not installed and a forty (40)
				  ampere power supply cord is provided, allow fifteen (15) amperes per leg for
				  air conditioning.
(C)
				Twenty-five percent (25%) of current of largest motor in item (B)
				above.
(D) Total of nameplate
				amperes for: disposal, dishwasher, water heater, clothes dryer, wall-mounted
				oven, cooking units.
Where number of these appliances exceed three (3), use
				  seventy-five percent (75%) of total.
(E) Derive amperes for free-standing range
				(as distinguished from separate ovens and cooking units) by dividing values
				below by two hundred thirty (230) volts.
Nameplate Rating
Use
10,000 w × or less
80% of rating
10,001 - 12,500 w
8,000 v-a
12,501 - 13,500 w
8,400 v-a
13,501 - 14,500 w
8,800 v-a
14,501 - 15,500 w
9,200 v-a
15,501 - 16,500 w
9,600 v-a
16,501 - 17,500 w
10,000 v-a
(F)
				If outlets or circuits are provided for other than factory-installed appliances
				include the anticipated load.
NOTE: The following example is given to illustrate the
				  application of this Method of Calculation:
EXAMPLE A mobile structure is 70 x 10 feet and has two (2)
				  portable appliance circuits, a 1000 watt 230 volt heater, a 200 watt 115 volt
				  exhaust fan, a 400 watt 115 volt dishwasher and a 7000 watt electric range.
				  Lighting and small appliance load.
Lighting 70 × 10 × 3 =
2100 v-a
Small appliance 1500 × 2 =
3000 v-a
Laundry 1500 × 1 =
1500 v-a
6600 v-a
1st 3000 at 100%......................
........... 3000
Remainder (5100 - 3000 = 2000) @ 35%...
........... 1260
4260
4260 = 185 amperes per leg 230
1000 watt (heater) divided by 230 =
4.4 amp
200 watt (fan) divided by 115 =
1.7 amp
400 watt (dishwasher) divided by 115 =
3.5 amp
7000 watt (range) ×.8 divided by 230 =
24.0 amp
Amperes Per Leg
A
B
Lighting and appliances
18.5
18.5
Heater (230 volt)
4
4
Fan (115 volt)
2
-
Dishwasher (115 volt)
-
4
Range
24
24
Totals
48.5
50.5
Based on the higher current calculated for either leg, use
				  one (1) fifty (50) ampere supply cord.