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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 needs to 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 also
meet applicable electrical codes and standards.