MAN0974-14-EN_XL7_XL7P_UM
July 6, 2022
Page 23 | 199
3.7
Factors Affecting Panel Layout Design and Clearances
The designer of a panel layout needs to assess the requirements of a particular system and to consider
the following design factors
.
3.7.1 Clearance / Adequate Space
Install devices to allow sufficient clearance to open and close the panel door.
Table 3.1
–
Minimum Clearance Requirements for Panel Box and Door
Minimum Distance between
base of device and sides of cabinet
2”
(50.80mm)
Minimum Distance between
base of device and wiring ducts
1.5
”
(38.10mm)
If more than one device installed in panel box
(or on door): Minimum Distance between
bases of each device
4”
(101.60mm) between bases of each device
When door is closed:
Minimum distance between device and
closed door
(Be sure to allow enough depth
for the OCS.)
2”
(50.80mm)
3.7.2 Grounding
Panel box: The panel box must be properly connected to earth ground to provide a good common ground
reference.
Panel door: Tie a low impedance ground strap between the panel box and the panel door to ensure that
they have the same ground reference.
3.7.3 Temperature / Ventilation
Ensure that the panel layout design allows for adequate ventilation and maintains the specified ambient
temperature range. Consider the impact on the design of the panel layout if operating at the extreme
ends of the ambient temperature range. For example, if it is determined that a cooling device is required,
allow adequate space and clearances for the device in the panel box or on the panel door.
WARNING: It is important to follow the requirements of the panel manufacturer
and to follow all applicable electrical codes and standards.
WARNING: Be sure to meet the ground requirements of the panel manufacturer and meet
applicable electrical codes and standards.
