SiMX042215E
Safety Cautions
Introduction
5
Checking electrical devices
Repair and maintenance to electrical components shall include initial safety checks and
component inspection procedures. In case there is any fault that could endanger safety, no
electrical supply shall be connected to the circuit until the fault is satisfactorily dealt with.
Initial safety checks shall include:
that capacitors are discharged: this shall be done in a safe manner to avoid possibility of
sparking;
that no live electrical components and wiring are exposed while charging, recovering or
purging the system;
that the equipment is earthed at all times.
Repairs to sealed components
During repairs to sealed components, all electrical supplies shall be disconnected from the
equipment being worked upon before the removal of any sealed covers, etc. If it is absolutely
necessary to have power supplied to equipment during servicing, continuously operating
leak detection shall be installed at the most dangerous point of the system in order to warn of
a potentially hazardous situation.
Particular attention shall be paid to the following: ensure that working on electrical
components does not alter the casing in such a way that affects the level of protection
including damage to cables, excessive number of connections, terminals different from the
original specification, damage to seals, incorrect fitting of glands, etc.
Ensure that the equipment is mounted securely.
Ensure that seals or sealing materials have not degraded such that they no longer serve the
purpose of preventing the ingression of flammable atmospheres. Replacement parts shall be
in accordance with the manufacturer's specifications.
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 before working on them.
Repair to intrinsically safe components
Do not apply any permanent inductive or capacitance load to the circuit without ensuring that
this will not exceed the permissible voltage and current for the equipment in use.
Only intrinsically safe components can be worked on in the presence of a flammable
atmosphere.
The test apparatus shall be of correct rating.
Replace components only with parts specified by the manufacturer. Using other parts may
result in ignition of the refrigerant leaked into the atmosphere.
Wiring
Check that wiring is not 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 ageing or continuous vibration from sources such as compressors or fans.
Detecting of R-32
Under no circumstances shall potential sources of ignition be used in the search for or
detection of refrigerant leaks. A halide torch (or any other detector using a naked flame) shall
not be used.
