GRN (Polycarbonate)
The GRN
enclosure has been designed as a cost-effective junction box for use in
hazardous areas. There are a number of terminal and entry configurations
available, resulting in a highly versatile enclosure which is suitable for a
wide variety of installations.
The enclosure is manufactured
in a UL approved UV stabilised polycarbonate and is available as a
pre-assembled terminal box or as an empty enclosure for OEM applications. It
can be supplied with the option of a terminal rail, an internal chassis plate
or directly mounted terminals for cables up to 4 sq mm.
The GRN8 is a competitive
product for lower risk applications in both safe and hazardous areas. It is
designed to operate within the ambient temperature range of - 20°C to + 40°C
but for non hazardous application the upper ambient temperature range can be
extended to + 90°C.
As well as being UV stable,
polycarbonate is resistant to a wide variety of chemicals. The use of
silicone rubber lid gasket and 316 stainless steel lid fixings ensures that
the chemical resistance of the GRN is not compromised. Earthing can be
accomplished by various means. The provision of an internal/external
earth/ground stud is optional or one of the terminals can be dedicated to
earthing / grounding functions.
Additionally, there is the
facility to mount an earth bar inside the box which can be used to terminate
and connect as many earthing wires as there are cable entries. This method is
useful for the equi-potential bonding of metal cable glands and an additional
equi-potential wire can be linked to the internal/external earth stud to
facilitate a positive connection to the ‘plant dirty’ earthing system. The
earth bar can alternatively be used as a clean earth for instrumentation as
it can be electrically isolated from the dirty earth.
The GRN is ATEX certified for
use in Zone 1 hazardous areas Ex ‘e’ to BS EN 50019:2000 for Zone 1 and Zone
2 applications, BS EN 50281-1 for Zone 21 and Zone 22 applications and Ex‘nA’
to BS EN 50021 for Zone 2 applications.
