HORNER HE-XE1E2 - Factors Affecting Panel Layout Design and Clearances; Clearance; Adequate Space; Grounding; Temperature; Ventilation

MAN0878-09-EN_XLE_XLT_UserManual
A u g u s t 2 3 , 2 0 1 8 P a g e 20 | 158
3.6 Factors Affecting Panel Layout Design and Clearances
The designer of a panel layout must assess the requirements of a particular system and to
consider the following design factors. A convenient checklist is provided in Section 3.6.7.
3.6.1 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 XLE/XLT.)
2” (50.80mm)
3.6.2 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.
3.6.3 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.