13-EN 14-EN
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• 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 specication,
damage to seals, incorrect tting of glands, etc.
• Ensure that apparatus is mounted securely.
• Ensure that seals or sealing materials have not degraded to
the point that they no longer serve the purpose of preventing
the ingress of ammable atmospheres.
• Replacement parts shall be in accordance with the
manufacturer's specications.
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.
11. 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.
• Replace components only with parts specied by the
manufacturer.
• Other parts may result in the ignition of refrigerant in the
atmosphere from a leak.
12. Cabling
• Check that cabling will not be subject to wear, corrosion,
excessive pressure, vibration, sharp edges or any other
adverse environmental effects.
• Check shall also take into account the effects of aging or
continual vibration from sources such as compressors or fans.
- Marking to the equipment continues to be visible and
legible. Markings and signs that are illegible shall be
corrected.
- Refrigeration pipe or components are installed in a position
where they are unlikely to be exposed to any substance
which may corrode refrigerant containing components,
unless the components are constructed of materials which
are inherently resistant to being corroded or are suitably
protected against being so corroded.
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 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.
10. 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 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.
