Table 2
Demand Factors for Specific Loads (See Note 1)
ESTIMATED
QUICK
TYPES OF LOADS
RANGE OF
ESTIMATING
DEMAND FACTOR
DEMAND FACTOR
(%)
(%)
MOTORS:
General purpose, machine tool, cranes,
elevators, ventilation, compressors,
pumps, etc. ..............................
20 - 100
30
MOTORS:
Miscellaneous, fractional, and
small appliances .........................
10 - 50
25
Resistance ovens, heaters, and furnaces ....
80 - 100
80
Induction furnaces .........................
80 - 100
80
Lighting ...................................
65 - 100
75
Arc welders ................................
25 - 50
30
Resistance welders .........................
5 - 40
20
Air-conditioning equipment .................
60 - 100
70
Refrigeration compressors ..................
40 - 100
60
Note 1: Demand factors include allowance for system loss.
Table 3
Annual Hours of Demand Usage for Specific Loads
QUICK ESIMATING HOURS USE
TYPES OF LOADS
1-SHIFT
2-SHIFT
3-SHIFT
OPERATION
OPERATION OPERATION
MOTORS:
General purpose .......................
1,200
1,600
2,000
MOTORS:
Miscellaneous, fractional, and
small appliances ......................
1,500
1,800
2,100
Resistance ovens, heaters, and furnaces .
1,000
1,300
1,600
Induction furnaces ......................
900
1,200
1,500
Lighting ................................
2,200
2,800
3,500
Arc welders .............................
500
700
900
Resistance welders ......................
500
700
900
Air-conditioning equipment
Less than 1,500 cooling degree days ... 1,200
1,400
1,600
1,500 to 1,500 cooling degree days .... 1,600
1,800
2,000
More than 2,500 cooling degree days ... 2,200
2,500
2,800
11
Previous Page
