Coltech MDDE-10DEN3-QA3 - Page 6

6
ENGLISH
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: 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,
recoveringor 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 shali be located at themost critical
point to warn of apotentially hazardous situation.
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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.
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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.