I-800N-01.doc Issue 16 04/02/2021 4
IOM – 800 SERIES - ZONE 2 FLOODLIGHTS (ATEX, Ex n)
3.6.2 Cable Glands
Cable glands and sealing plugs when installed must maintain the restricted breathing enclosure. Entries suitable
for M20 cable glands are standard.
To maintain the restricted breathing properties of the enclosure a suitable cable gland such as a Hawke
501/453/RAC type should be installed or a cable gland satisfying the following requirements:
The cable gland must satisfy the requirements for en 60079-0 and must maintain an ingress rating of at
least IP65.
The certified cable gland is to be a compression type gland where the cable sheath is evenly compressed
when tightened or an Ex d stuffing type or a punched seal type.
To enable a reliable seal at the cable entry face a neoprene or silicone rubber washer and a stainless steel
washer are provided for each entry and must be fitted.
3.7 Cabling and Fitting Lamps
Access for cabling and fitting lamps is by removing the front cover. Before removing the cover on any occasion,
check that the support chain is sound. The cover is released by undoing the six toggle clips using a screwdriver
or a peg through the hole in the clip. The reflector is removed by releasing four screws. The baffle plate is
removed by undoing the four M5 nuts on the underside. Reselect the voltage tappings if necessary. Install the
conductors in the appropriate terminals. Take care not to cut back the insulation excessively, 1mm bare
conductor outside the terminal is a maximum. Any unused terminal should be fully tightened. When the cabling
is complete, make a final tightness and connection check. Lamps must be of the correct type and firmly screwed
into place. The cover is replaced and the toggle clips snapped back over.
3.8 Inspection and Maintenance
Visual inspection should be carried out at a minimum of 12 monthly intervals and more frequently if conditions
are severe. The time between lamp changes could be very infrequent and this is too long a period without
inspection.
3.8.1 Routine Examination
The equipment must be de-energised before opening. Individual organisations will have their own procedures.
What follows are guidelines based on EN 60079-17 and on our experience:
1 Ensure the lamp is lit when energised and that the lampglass is not damaged.
2 When de-energised and left to cool, there should be no significant sign of internal moisture. If there are
signs of water ingress, the luminaire should be opened up, dried out, and any likely ingress points
eliminated by re-gasketting.
3 Check the cable gland for tightness and nip up if necessary.
4 Check all cover toggle clips for tightness. If they appear slack, re-set by reducing the angle of the long
sides of the clips by bending until they require firm pressure to lock in place.
5 Clean the lampglass.
6 When relamping, check that the cover gasket has not softened or become excessively deformed, if in doubt
replace ( See Section 4.0 ).
3.9 Electrical Fault Finding and Replacement
The supply must be isolated before opening the luminaire.
In most instances, the faults are simple, namely loose or broken connections, unserviceable lamps or open
circuit control gear. Control gear will not normally go open circuit unless it has first over-heated; the signs of this
are obvious, being severe discoloration of the paint on the gear and cracks in any exposed insulation. Similarly,
a bad contact at the lamp cap will usually result in discoloration as a sign of overheating.
Any fault finding must be done by a competent electrician and, if carried out with the luminaire in place, under a
permit to work. With HPS and MBI, the ignitor can become faulty. If the lamp is fitted, the choke has continuity
and the connections are good and correct, they should produce an attempt to start effect in the lamp and a
buzzing sound from the ignitor. It will be unusual to have no other parts available to perform a substitution fault
finding routine and this is the normal procedure. Before re-assembling, all connections should be checked and
any damaged cable replaced. The ignition connection to the lampholder is sleeved with H.T. sleeving and this
must be kept in place.
