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ENG

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:

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.

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 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

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.

19. 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 into account the effects of aging or continual

vibration from sources such as compressors or fans.

20. Detection of flammable refrigerants

Under no circumstances shall potential sources of ignition be used in the searching for or detection of

detection equipment shall be set at a percentage of the LFL of the refrigerant and shall be calibrated to the

refrigerant employed and the appropriate percentage of gas (25 % maximum) is confirmed.

Leak detection fluids are suitable for use with most refrigerants but the use of detergents containing chlorine

shall be avoided as the chlorine may react with the refrigerant and corrode the copper pipe-work.

If a leak is suspected, all naked flames shall be removed/ extinguished.

If a leakage of refrigerant is found which requires brazing, all of the refrigerant shall be recovered from the

system, or isolated (by means of shut off valves) in a part of the system remote from the leak. Oxygen free

nitrogen (OFN) shall then be purged through the system both before and during the brazing process.

22. Removal and evacuation

When breaking into the refrigerant circuit to make repairs or for any other purpose conventional procedures