Horner APG RX371 OCS HERX371C101 - Manual (Page 20)

CH. 3 MAN0924-01-EN
February 8, 2010 Page 20 of 124 # 1018
3.6 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.
3.6.1 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 inches (50.80mm)
Minimum Distance between base of device and wiring ducts 1.5 inches (38.10mm)
If more than one device installed in panel box (or on door):
Minimum Distance between bases of each device
4 inches between bases of each
device (101.60mm)
When door is closed:
Minimum distance between device and closed door
(Be sure to allow enough depth for RX-371 OCS)
2 inches (50.80mm)
3.6.2 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.
3.6.3 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.
3.6.4 Orientation
When panel-mounted, there are no orientation restrictions on the RX-371 OCS.
3.6.5 Noise
Consider the impact on the panel layout design and clearance requirements if noise suppression devices
are needed. Be sure to maintain an adequate distance between the RX-371 OCS and noisy devices
such as relays, motor starters, etc.
Warning: It is important to follow the requirements of the panel manufacturer and to follow
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.