electrical safety (2)
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ELECTRICAL SAFETYELECTRICAL SAFETY
Lecture # 1
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IntroductionIntroduction
Electric Shocks
Working on energized circuits or
equipment.
Fuse replacement
Discharging machines to ground.
Earthing of equipment.
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ELECTRIC SHOCKSELECTRIC SHOCKS Short Circuit caused by accidentally
placing or dropping a metal, tool or other
conducting material across an energizedline.
Shocks can be prevented by
Awareness and positive attitude towards
electrical safety. Never take short cuts
Strict adherence to maintenance routines.
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All electrical equipment to be earthed.
Equipment should be handled in de-energized
state. All capacitors to be discharged before
working on equipment fitted with capacitors.
Insulated tools/shortening straps should be
used to discharge the equipment. Supplies are to be isolated iaw TAG OUT
PROCEDURE.
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TREATMENT OF ELECTRICTREATMENT OF ELECTRIC
SHOCKSSHOCKS Result of electric shocks may be
immediate death or unconsciousness,with
paralysis of muscles of respiration. IF CASUALITY IS BREATHING
Call for Medical assistance and do not leavethe causality unattended.
IF CASUALITY IS NOT BREATHINGCall for Medical assistance and start artificial
breathing.
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WORKING ON DEADWORKING ON DEAD
EQUIPMENTEQUIPMENT Isolate the equipment iaw BR 200(52)
Check the equipment with a voltage tester
b/w phases and b/w phases and earth.
Ensure capacitors associated withequipment are fully discharged .
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WORKING ON LIVEWORKING ON LIVE
EQUIPMENTEQUIPMENT MEOs permission must be obtained.
Work in pairs.
Wear rubber gloves if practicable. Use insulated tools.
Stand on insulating rubber mats.
Wear insulating foot wear. Be aware of the voltages that are or can be
present.
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WORKING ON LIVEWORKING ON LIVE
EQUIPMENTEQUIPMENT Do not rely on interlocks or other safety
devices.
Make sure tools do not cause short circuits.
Work with one hand if possible.
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FUSE REMOVAL ANDFUSE REMOVAL AND
REPLACEMENTREPLACEMENT REMOVAL
All users of supplies to be isolated must be
consulted. Ensure all services have been switched off and
tagged out. Exception to 115 volts where it isimpractical to switch off all the lights fed from
a set of fuses. When supplies have been isolated and the
fuses are about to be removed
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FUSE REMOVAL ANDFUSE REMOVAL AND
REPLACEMENTREPLACEMENT Place finger firmly in the center of the fuse
holder.
With free hand unscrew the fuse holder using thefuse key.
When fully unscrewed, firmly grasp the holder
turn head away and remove the fuse
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FUSE REMOVAL ANDFUSE REMOVAL AND
REPLACEMENTREPLACEMENT INSERTION
Remove empty fuse from fuse ways.
Using approved test equipment, test for
voltage across empty fuse way to ensure that
fuse way is dead.
Repeat step b on all empty fuse ways beforeinserting fuses.
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EARTHING OF EQUIPMENTEARTHING OF EQUIPMENT
All fixed, transportable or portableequipment is to be bonded to ships hull.
As hull is at EARTH zero potential henceall equipment connected will be at zeropotential.
This ensures that in the event of an
equipment casing becoming live for anyreason, personal coming into contact willnot receive shock.
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