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avoid possibility of sparking;
That there no live electrical components and wiring are exposed while char-
ging, recovering or purging the system; That there is continuity of earth bon-
ding.
7.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 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, exces-
sive 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 wi-
thout 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 com-
ponents only with parts specified by the manufacturer. Other parts may re-
sult in the ignition of refrigerant in the atmosphere from a leak.
9.Cabling
Check that cabling will not be subject to wear, corrosion, excessive pres-
sure, 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.
10.Detection of flammable refrigerants
Under no circumstances shall potential sources of ignition be used in the
searching for or detection of refrigerant leaks. A halide torch (or any other
detector using a naked flame) shall not be used.
ENG
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