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ty checks and component inspection procedures. If a fault exists that could
compromise safety, then no electrical supply shall be connected to the cir-
cuit until it is satisfactorily dealt with. If the fault cannot be corrected
immediately but it is necessary to continue operation, an adequate tempo-
rary solution shall be used. This shall be reported to the owner of the
equipment so all parties are advised.
Initial safety checks shall include:
That capacitors are discharged: this shall be done in a safe manner to
avoid possibility of sparking;
That there no live electrical components and wiring are exposed while
charging, recovering or purging the system;
That there is continuity of earth bonding.
Repairs to sealed components
1) During repairs to sealed components, all electrical supplies shall be dis-
connected from the equipment being worked upon prior to any removal of
sealed covers, etc. If it
isabsolutely 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 situa-
tion.
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 aected. This shall include damage to cables,
excessive number of connections, terminals not made to original specica-
tion, damage to seals, incorrect tting 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 ammable atmo-
spheres. Replacement parts shall be in accordance with the manufactur-
er‘s specications.
NOTE: The use of silicon sealant may inhibit the eectiveness of some
types of leak detection equipment. Intrinsically safe components do not
have to be isolated prior to working on them.
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 ammable atmosphere. The test apparatus shall be at the
correct rating.
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