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Safety Precaution:
Every switching is very important .Safety precaution must take it seriously .Below are the Switching precautions.
1) Before we do any switching, we must write down all the switching procedure clearly and explain to CP(Competent person)/team members.
2) Every switching ,AP(Authorize Person) must accompany by a CP(Competent Person),this is because CP will observe whether AP is doing the right procedure.
3) AP must make sure inside the substation has enough lighting to do switching.
4) AP must make sure in front of switching panel laid a rubber map on floor for safety purpose.
5) AP must wear PPE(Personal Protective Equipments)fully .Example of PPE :Fire Redundant Suit ,Glove ,Safety helmet with vessel ,Safety boots.
6) AP have to make sure and check all the tools are in good condition and fulfill TNB standard and record down in a check list.
7) AP must record down every load reading before and after inside a log book for reference.
8) Before switching ,AP must check whether switch gear is in good condition to do switching .Standard checking can be done with checking SF6 Gas Gauge at the switch gear ,and observe any blackening marks on physical switch gear or checking whether got Ozone smell from the switch gear or not.
9) Every switching activities must come out with 4 important steps Switch Off ,Rank Out ,Prove Dead ,Earth On
10) Phasing stick is used to prove the system dead .There are two type of phasing strict ,namely subtraction and addition types .A subtraction phasing stick in phase it will show 0V,meanwhile Addition Phasing Stick type in phase will show 12.6V.
11) “Non Standard ”lock is a need to lock at the switch gear handle termination/PDS(Partial Discharge Spout) to prevent anonymous people go and do a dangerous switching.
12) Precaution notice needed to put on the non standard lock and written person in charge Name and Hand Phone Number.
13) Barriers and dangerous notice needed to put in front of work space to aware public on safety.
14) PTW(Permits to works)only can be issued to contractor when the system is proven dead and Earth On.