TM
5-811-1/AFJMAN
32-1080
APPENDIX B
SIZING OF DISTRIBUTION TYPE TRANSFORMERS
FOR FAMILY HOUSING UNITS
B-2. Distribution Transformers. Distribution
B-1. Application. Design factors apply only to
transformers serving family housing areas will
aerial or pad-mounted compartmental distribution
have the air conditioning or electric heating loads,
transformers supplying family housing units.
whichever is larger, sized for 100 percent demand.
The rest of the load will be sized in accordance
with the demand factors of table B-l.
Table B-l. Demand Factors.
Demand factor
Demand factor
Demand factor
Number of units
percent
Number of units
Number
units
percent
percent
of
18.0
13.2
80.0
17.5
13.0
60.0
50.0
17.1
12.8
45.0
12.6
16.6
40.0
16.1
12.4
35.0
15.8
12.2
32.0
12.0
15.6
29.0
15.4
11.8
27.0
15.2
11.6
11.4
25.0
15.0
24.0
11.2
14.8
23.0
14.6
11.0
22.0
14.4
10.8
21.0
14.2
10.6
10.4
20.0
14.0
19.4
13.8
10.2
18.7
13.6
10.1
18.3
13.4
10.0"
a
Same demand factor applies to all quarters over 54.
B-1
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