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Checks of electrical devices.
Repair and maintenance of electrical components should include initial safety checks and component
inspection procedures. If there is a fault that may compromise safety, no electrical supply should be
connected to the circuit until it is satisfactorily resolved. If the fault cannot be corrected immediately, but
continued operation is necessary, a suitable temporary solution must be used. This shall be
communicated to the owner of the equipment so that all parties are informed.
Initial safety checks shall include:
- that capacitors are discharged: this must be done in a safe manner to avoid the possibility of sparking;
- that no electrical components or wiring are exposed while charging, recovering or purging the system;
- That there is continuity of grounding.
Repair of sealed components.
During repairs to sealed components, all electrical supplies should be disconnected from the equipment
being worked on before removing sealed covers, etc. If it is absolutely necessary to have power supply
to the equipment during repairs, permanent leak detection must be carried out. This should be done at
the most critical point to warn of a potentially dangerous situation.
Special attention must be paid to the following to ensure that, when working with electrical components,
the enclosure is not altered in such a way as to affect the level of protection. For example, damage to
cables, excessive number of connections, terminals not made to the original specification, damage to
seals, incorrect mounting of bushings, etc.
Ensure that the product is properly assembled.
Ensure that gaskets or sealing materials have not degraded to the point where they are no longer
suitable for preventing the ingress of flammable atmospheres. Spare parts must conform to the
manufacturer's specifications.
Repair of intrinsically safe components.
Do not apply any permanent inductive or capacitive load to the circuit without ensuring that it will not
exceed the permissible voltage and current for the equipment in use.
Intrinsically safe components are the only ones that can be worked on in the presence of a flammable
atmosphere. Test apparatus must be in the correct classification.
Replace components only with parts specified by the manufacturer. Other parts may cause ignition of
the refrigerant in the atmosphere due to leakage.
Wiring
Check wiring for wear, corrosion, excessive pressure, vibration, sharp edges or any other adverse
environmental effects. The check should also take into account the effects of ageing or continuous
vibration from sources such as compressors or fans.
Detection of flammable refrigerants.
Under no circumstances should potential ignition sources be used when searching for or detecting
refrigerant leaks. A halide torch (or any other detector using an open flame) must not be used.
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