2
INM9120 Rev 8
2
INSTALLATION
2 .1 MOUNTING & ENCLOSURE REQUIREMENTS
2 .1 .1
General
These power supplies may be mounted in safe areas, Zone 2 hazardous areas but, wherever they
are located, the mounting conditions must:
(a) maintain safe segregation distances for units and IS wiring.
(b) prevent any form of pollution that could compromise the operation, or safety of the unit. For
example, an unpolluted location or a suitable enclosure could be chosen.
(c) provide an adequate level of mechanical protection. This can be achieved by selecting a
protected location, a suitable enclosure,or a combination of both.
(d) ensure that all cable entries and connections are secure by making provision for the careful
routing and securing of all cables.
(e) provide adequate security against unauthorised inter
(f) ensure that the permitted ambient temperature range of the units (–40°C to + 70°C) is not
exceeded. Power dissipation within the enclosure and the use of shading against direct
sunlight should be considered.
2 .1 .2
Outdoor mounting
Where power supplies are mounted in outdoor locations then the use of a suitably approved
enclosure is recommended. For Zone 2 locations, Ex e or Ex n enclosures are an economic
solution that satisfy the minimum acceptable criteria of a 7Nm impact test and IP54 ingress
protection. However, in some locations a higher degree of ingress protection or corrosion
resistance may be necessary or desirable. The emphasis should be placed on the suitability for
the application rather thanthe extent of certification,
2 .1 .3
Wiring segregation
The intrinsically safe wiring must be segregated from all other wiring.When units are mounted in
several parallel rows it is common practice for alternate rows to be reversed, so that the wiring
can share common looms or trunking. Because this involves alternate rows being mounted
“upside down”, this technique may be used only when the units are NOT required to operate at
the maximum ambient temperature (for the reasons stated in the previous paragraph).
