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6-9 Checks to electrical devices

Repair and maintenance to electrical components shall include initial safety checks

and component inspection procedures.

If a fault exists that could compromise safety, then no electrical supply shall be

connected to the circuit until it is satisfactorily dealt with.

If the fault cannot be corrected immediately but it is necessary to continue operation,

an adequate temporary 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

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 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.

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 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.

8. 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.

CAUTION

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