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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.
Repair to intrinsically safe components. Do not apply any
permanent inductive or capacitance 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 at 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.
Cabling. Check that cabling will not be subject to wear,
corrosion, excessive pressure, vibration, sharp edges or any
other adverse environmental effects. The check shall also take
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