Safety in shipyard Safety in shipyard (electrical (electrical

system)system)

Major uses of electrical sysMajor uses of electrical sys

Welding machine Welding machine Crane Crane CompressorsCompressors Motors Motors Cutting machine (CNC machine, plasma Cutting machine (CNC machine, plasma

cutter)cutter) Bending machineBending machine Various fitting machine (lathe, milling machine Various fitting machine (lathe, milling machine

etc)etc) Shore supply to vessel Shore supply to vessel Sand ballasting equipmentSand ballasting equipment

Electrical distribution systemElectrical distribution system

Major hazardsMajor hazards

Electrocution (shock burn)Electrocution (shock burn) Short circuitShort circuit FireFire Due to over load Due to over load

Electrocution Electrocution

The potential for electrical shock hazards The potential for electrical shock hazards is greater in shipbuilding and repair than is greater in shipbuilding and repair than in other industries, because workers stand in other industries, because workers stand on metal decks and often work in a wet on metal decks and often work in a wet environmentenvironment

ElectrocutionElectrocution

ReasonsReasons contact with or near to energized electrical equipment.contact with or near to energized electrical equipment. UnconsciousnessUnconsciousness Wetted surfaceWetted surface

precautionprecaution Before work is performed on circuits,, circuits must be Before work is performed on circuits,, circuits must be

deenergized and checked at the point where work will be deenergized and checked at the point where work will be performed to ensure the circuits are actually performed to ensure the circuits are actually deenergized.deenergized.

When testing or adjusting energized circuits, a rubber or When testing or adjusting energized circuits, a rubber or

other suitable insulated deck mat must be used. other suitable insulated deck mat must be used.

ElectrocutionElectrocutionprecautionsprecautions

De energizing the circuit must be appropriately De energizing the circuit must be appropriately completed by opening the circuit breaker, opening completed by opening the circuit breaker, opening the switch, or removing the fuse. the switch, or removing the fuse.

The circuit breaker, switch, or fuse location must be The circuit breaker, switch, or fuse location must be tagged to indicate work is occurring on the circuit. tagged to indicate work is occurring on the circuit. Such tags must not be removed nor the circuit Such tags must not be removed nor the circuit energized until the work has been completed. energized until the work has been completed.

When work is performed immediately adjacent to When work is performed immediately adjacent to exposed energized parts, these parts must be exposed energized parts, these parts must be covered (for example, insulated) or other equally covered (for example, insulated) or other equally safe means provided. safe means provided.

ElectrocutionElectrocutionprecautionsprecautions

Insulating materials (such as mats and gloves) Insulating materials (such as mats and gloves) should be periodically tested or inspected should be periodically tested or inspected

All electrical tools or equipment should undergo a All electrical tools or equipment should undergo a visual inspection before use. visual inspection before use.

All portable electric hand tools and temporary All portable electric hand tools and temporary lighting systems should utilize Ground Fault lighting systems should utilize Ground Fault Circuit Interrupters (GFCI). Circuit Interrupters (GFCI).

Only qualified electricians should attempt repair Only qualified electricians should attempt repair of electrical tools and equipment in use. of electrical tools and equipment in use.

Short circuitShort circuit

An abnormal condition (including an arc) An abnormal condition (including an arc) of relatively low impedance, between two of relatively low impedance, between two points of different potential in an electric points of different potential in an electric network or systemsnetwork or systems

it an undesirable condition arising from it an undesirable condition arising from failure of electrical insulationfailure of electrical insulation

Causes instant power failure Causes instant power failure Loss of appliances Loss of appliances

Fuse are used for avoiding short Fuse are used for avoiding short circuitcircuit

Circuit breakers are used for the Circuit breakers are used for the same purposesame purpose

Fire Fire

Electrical issuesElectrical issues– Overloaded circuits, damaged wiring, Overloaded circuits, damaged wiring,

and defective switches and outlets can and defective switches and outlets can all lead to electrical fires.all lead to electrical fires.

Electrical issuesElectrical issues– Small portable fans Small portable fans

can pose a fire can pose a fire hazard if they are hazard if they are placed near placed near combustible combustible materials, or where materials, or where the blades of the the blades of the fan can easily catch fan can easily catch items.items.

– Damaged wiring on Damaged wiring on portable fans, and portable fans, and mounting portable mounting portable fans in walls also fans in walls also increase your fire increase your fire risk.risk.

Prevention StrategyPrevention Strategy

ElectricalElectrical– Inspect all wiring, Inspect all wiring,

switches and plugs switches and plugs for damage. for damage.

Repair must be Repair must be performed by an performed by an “Electrical Qualified “Electrical Qualified Person”.Person”.

– All outlets, junction All outlets, junction boxes, and boxes, and electrical panels electrical panels must have proper must have proper covers.covers.

ElectricalElectrical– Do not overload Do not overload

motors or circuits, motors or circuits, which can easily which can easily become a source of become a source of ignition.ignition.

Ccl4 fire Ccl4 fire extinguisher should extinguisher should be placed in fire be placed in fire zonezone

– ElectricalElectrical Improper use of Improper use of

extension cords is extension cords is prohibited.prohibited.

– Always plug Always plug extension cords extension cords and power strips and power strips directly into directly into building wiring – no building wiring – no “daisy chaining”.“daisy chaining”.

– Use heavy-duty, Use heavy-duty, grounded, single grounded, single appliance appliance extension cords extension cords only.only.

ElectricalElectrical– Multiple plug Multiple plug

adapters are adapters are prohibited.prohibited.

Have additional wall Have additional wall outlets installed.outlets installed.

Use power strips Use power strips with breaker with breaker protection instead.protection instead.

Do not connect/disconnect electrical cords with wet hands.Do not connect/disconnect electrical cords with wet hands.

conclusionsconclusions

HRC fuses should be usedHRC fuses should be used For bringing power to the shipyard For bringing power to the shipyard

duplicate feeder (underground or duplicate feeder (underground or overhead) should be usedoverhead) should be used

Underground cable should be used Underground cable should be used for power transmission inside for power transmission inside shipyardshipyard

All the systems should be earthed All the systems should be earthed

Earth leakage and earth fault should Earth leakage and earth fault should be monitoredbe monitored

Protection against lightening should Protection against lightening should be madebe made

Auxiliary switch board should be Auxiliary switch board should be installedinstalled

Safety symbols should be placedSafety symbols should be placed

High voltage area should be specifiedHigh voltage area should be specified