Eaton Magnum PXR - Recommended Electrical Clearances; Recommended Enclosure Size;Ventilation; Condensation Heaters in Enclosures

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Maintenance, testing, and operating conditions
MAGNUM PXR PRODUCT GUIDE PA013006EN September 2022 www.eaton.com
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Recommended electrical clearances
The following electrical clearance information is provided
as guidance when installing drawout or fixed breakers in
an enclosure. Refer to the graphic representations and the
associated dimensional tables.
Table 32. ANSI Electrical clearance dimensions (in)
Breaker
mounting
Enclosure
dimensions
To
insulated
surface
To
grounded
metal
surface
With cell
switch or
key lock
Drawout A
B
0
1.0
0
1.0
0
1.0/2.9
Fixed A
B
5.9
1.2
9.8
2.8
—
—
Recommended enclosure size/ventilation
Graphics of typical enclosures with associated dimensions
are provided as guidance for breaker enclosure designs
with respect to the enclosure size and required amounts
of ventilation space.
Condensation heaters in enclosures
In certain environments, it is recommended to install a
thermostatically controlled heater inside of the enclosure.
This is intended to prevent the formation of condensation
within the enclosure or on electrical components, avoiding
any corrosion that might be caused by the moisture. Eaton
provides this option on all enclosures.
W - Cassette width
+3.0 in +75 mm
H - Height
21.7 in 550 mm
D - Front compartment depth
17.7 in 450 mm
V - Ventilation (800-3200A)
25 in2 160 mm2
Ventilation (4000-6300A)
Figure 86. Recommended enclosure electrical clear-
ances inches (mm)
Figure 87. Minimum enclosure size/ventilation