Horner-apg QX351 OCS HEQX351C103 Manuel d'utilisateur télécharger pdf (Page 20)

CH. 3 MAN0892-03-EN

February 25, 2010 Page 20 of 109 # 1039

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 QX351 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 QX351 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 QX351 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.

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Horner-apg QX351 OCS HEQX351C103 Manuel d'utilisateur Page 20