8
English
• That no live electrical components and wiring are exposed
while charging, recovering or purging the system.
• That there is continuity of earth bonding.
10. Repairs to sealed components
During repairs to sealed components, all electrical supplies shall
be disconnected from the equipment being worked upon prior
to any removal of sealed covers, etc. If it is absolutely necessary
to have an electrical supply to equipment during servicing, then
a permanently operating form of leak detection shall be located at
the most critical point to warn of a potentially hazardous situation.
Particular attention shall be paid to the following to ensure that
by working on electrical components, the casing is not altered in
such a way that the level of protection is affected. This shall include
damage to cables, excessive number of connections, terminals
not made to original specification, damage to seals, incorrect
fitting of glands, etc.
• Ensure that apparatus is mounted securely.
• Ensure that seals or sealing materials have not degraded such
that they no longer serve the purpose of preventing the ingress
of flammable atmospheres. Replacement parts shall be in
accordance with the manufacturer’s specifications.
Note:
The use of silicone sealant may inhibit the effectiveness
of some types of leak detection equipment. Intrinsically safe
components do not have to be isolated prior to working on them.
11. Repair of intrinsically safe components
Do not apply any permanent inductive or capacitive loads to
the circuit without ensuring that this will not exceed the permissible
voltage and current permitted for the equipment in use. Intrinsically
safe components are the only types that can be worked on while
live in the presence of a flammable atmosphere. The test apparatus
shall be of the correct rating. Replace components only with parts
specified by the manufacturer. Other parts may result in the ignition
of refrigerant in the atmosphere from a leak.
