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.
1.108.4 +
⎟
⎠
⎞
⎜
⎝
⎛
×=
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
= (2DW + 2DH + 2WH) / 144
D = Depth in inches
H = Height in inches
W = Width in inches
Enclosure Size
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