PY Manual
Copyright © 2006 SANYO DENKI
AMERICA
, Inc.
19
When sizing a NEMA 12 or equivalent enclosure with no active method for cooling, the
following equation approximates the size of enclosure required.
1
.
1
08
.
4
+
⎟
⎠
⎞
⎜
⎝
⎛
×
=
A
Q
T
Where:
T
= Temperature difference between inside air (130
°
F maximum) and outside
air [
°
F]
Q
= Total amount of heat generated in the enclosure [W]
A
= Surface area of the enclosure in ft
2
= (2
DW
+ 2
DH
+ 2
WH
) / 144
D
= Depth in inches
H
= Height in inches
W
= Width in inches
Enclosure Size
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