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• the charge size is in accordance with the room size within which the refrigerant containing parts are
installed;
• the ventilation machinery and outlets are operating adequately and are not obstructed;
• if an indirect refrigerating circuit is being used, the secondary circuits shall be checked for the pres-
ence of refrigerant; marking to the equipment continues to be visible and legible.
• marking 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, and 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: this shall be done in a safe manner to avoid possibility of sparking
• that there no live electrical components and wiring are exposed while charging, recovering or purg-
ing the system;
• that there is continuity of earth bonding.
10. Repairs to sealed components
10.1 During repairs to sealed components, all electrical supplies shall be disconnected from the equip-
ment 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.
10.2 Particular attention shall be paid to the following to ensure that by working on electrical com-
ponents, 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 specifi-
cation, 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 pur-
pose of preventing the ingress of flammable atmospheres. Replacement parts shall be in accor-
dance with the manufacturer’s specifications.
NOTE: The use of silicon sealant may inhibit the effectiveness of some types of leak detection equip-
ment. Instrinsically safe components do not have to be isolated prior to working on them.
