IOM
– STERLING III - ZONE 2 LED (ATEX, IECEx, Ex ec)
I-ST3N-01.doc
Issue 8
December 2018
5
3.6.4
Cabling
Access for cabling is via diffuser cover; care is to be taken, as there is no suspension of diffuser cover. The
diffuser clip screws are removed and the diffuser clips are undone and the diffuser laid aside. The gear tray is
dropped down after unclipping the steel mounting clips. The tray can be removed by undoing the spring clips on
the suspension cables. Any earth tag connections should be fitted.
The connecting terminals are identified and the conductors should be bared back so that they make full contact in
the terminals, but the bare conductor should not be more than 1mm beyond the terminal. Unused terminal screws
should be tightened. The cores must be identified by polarity and connected in accordance with the terminal
markings. Before re-fitting the cover, a final check on the correctness of connections should be made.
3.7 Replacing
LED’s
Before opening the diffuser cover, ensure that the luminaire is isolated from mains supply. Access is via the
diffuser cover; care is to be taken, as there is no suspension facility for the diffuser cover.
It is recommended on failure of LE
D’s an entire geartray kit including driver should be fitted. This will maximise the
lifetime of the product.
Note:
The diffuser cover must be refitted in its original orientation to maintain the IP rating & diffuser clips
snapped into place.
Self-tapping screws are supplied with the luminaire to lock the diffuser clamps.
These must be fitted to maintain
the certification.
Refer to EN/IEC 60079-10-2 & EN/IEC 61241-14 for additional details of selection, installation and maintenance.
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/IEC 60079-17 and on our experience:
1
Ensure LED’s are lit when energised by mains supply.
2 Visually check diffuser cover for damage. This should only be cleaned using a damp cloth to avoid static
and only use recommended detergents for polycarbonate. If the polycarbonate is discoloured or damaged,
a new diffuser cover must be fitted.
3 When de-energised and left to cool, there should be no significant sign of internal moisture. If there are
any signs of water ingress, the luminaire should be opened up, dried and any likely ingress points
eliminated by re-gasketing or other replacements. If the diffuser cover is removed, its orientation must be
noted and it must be refitted in the original orientation.
4 Check cable gland for tightness and nip up if required.
5 Check any external and internal earths.
6 Check all terminations are firmly screwed down, tighten if necessary.
7 Check clips visually for any damage and replace, if necessary.
8 If it has been suspected that the luminaire has suffered mechanical damage, a stringent workshop check
on all components should be made. All components can be removed from the luminaire for inspection.
9 Avoid the build up of dust layers by regular cleaning and again clean only using a damp cloth.
3.8
Electrical Fault Finding and Replacement (Refer EN / IEC 60079-19)
The supply must be isolated before opening the luminaire.
Any live fault finding must be done by a competent electrician and, if carried out with luminaire in place, under a
permit to work.
The electronic drivers are approved components.
On re-assembly, all faulty/damaged wiring should be replaced and connections checked.
