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5.4.2 Repairs to Sealed Components
5.4.2.1 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.
5.4.2.2 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 notmade 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.
Notice：The use of silicon 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.
5.4.3 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 .
DC Inverter U-match Series Floor Ceiling Type Unit
57
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