Electrical Safety and Standards

Occupational and Health Safety Operational Precautions in a Power House

A powerhouse (hydro, thermal or diesel) contains high-voltage equipment, rotating machinery, pressurised oil/water systems and confined spaces. The following operational precautions are standard:

1. Electrical safety

• Strict enforcement of lock-out/tag-out (LOTO) before any maintenance on generators, transformers, switchgear and busbars.
• Use of rubber gloves, insulated tools, discharge rods and earthing of terminals before work; verify "dead" with a tester.
• Display of danger boards, barricading of live panels, and restricted entry to switchyard/control room.
• Earthing of all non-current-carrying metal parts; periodic earth-resistance testing.

2. Mechanical safety

• Machine guards on couplings, shafts, belts and flywheels; interlocked gates on turbine pits.
• Emergency stop buttons at strategic points; isolation of penstock/valve before turbine work.
• Safe lifting practices for generator rotor, transformer and heavy spares using certified cranes and slings.

3. Fire and explosion safety

• Fire extinguishers (CO₂ for electrical, foam/DCP for oil), hydrant system and automatic fire detection in cable galleries and transformer bays.
• No smoking near oil storage; oil spill containment and proper disposal.
• Transformer oil testing and Buchholz relay protection to prevent tank explosion.

4. Confined space and working-at-height safety

• Entry into draft tube, surge tank or oil tank only with permit, gas testing, ventilation, safety belt and a standby observer.
• Scaffolding, guard rails and fall-arrest harness for work on towers, cranes and roofs.

5. Personal protective equipment (PPE) and training

• Mandatory helmet, safety shoes, goggles, ear plugs in machine hall, and insulated gloves for electrical work.
• Regular safety training, toolbox talks, first-aid and CPR training, and mock fire/evacuation drills.
• Health surveillance: audiometry for noise exposure, medical check-ups for workers handling chemicals or working in hot/humid areas.

6. Administrative and emergency measures

• Safety committee, accident reporting and investigation, and compliance with Labour Act 2074 and ILO conventions.
• Emergency lighting, communication system, assembly point and rescue equipment; tie-up with nearest hospital.
• Proper ventilation and illumination in machine hall, cable gallery and battery room (hydrogen venting).

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Social Issues During Construction and After Operation

A. During construction

1. Land acquisition and displacement — involuntary resettlement, loss of agricultural land and homesteads, inadequate compensation, and disputes over valuation.
2. Loss of livelihood — affected farmers, fishermen and forest-dependent families lose income sources; local employment is often low-skilled and short-term.
3. Influx of migrant workers — pressure on local housing, water, health services; risk of communicable diseases and social tension.
4. Cultural and religious impact — submergence or damage to temples, cremation ghats, festivals and community assets.
5. Environmental-health issues — dust, noise, blasting vibration, slope instability and landslides affecting nearby settlements.
6. Traffic and safety — heavy vehicle movement on rural roads causing accidents and damage to local infrastructure.
7. Inequity in benefit sharing — compensation and contracts captured by elites; grievances and protests, sometimes leading to work stoppage.

B. After operation

1. Resettlement and rehabilitation gaps — displaced families not fully resettled or provided sustainable livelihoods; second-generation issues.
2. Downstream impacts — reduced water flow, loss of fish and aquatic life, difficulty in irrigation and traditional water mills, affecting downstream communities.
3. Health and safety risks — risk of dam-break flooding, reservoir-induced landslides, and water-borne diseases in the reservoir area.
4. Social inequality — benefits (electricity, royalty, free electricity share) not reaching affected households; local vs. outside employment conflict.
5. Cultural loss — submerged heritage, changed settlement patterns and erosion of traditional practices.
6. In-migration and urbanisation — growth of unplanned settlements near the project, straining local services.
7. Ongoing grievances — demands for royalty, local shares, compensation for crop/land damage, and periodic strikes or obstruction of operation.

Mitigation approach: proper EIA/SIA, free prior informed consent, fair and timely compensation, local employment and skill development, community development and benefit-sharing (royalty, local area development fund), grievance-redress mechanism, and continuous monitoring with participation of affected people.