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Electrical and MHE Issues

Electrical and MHE Issues. Allocation of Electrical Categories. Summary of Electrical Categories. Category A: Explosive gases present Category B: Explosive Dust Category C: Explosives, but no vapour/dust Category D: Small quantities (except HD 1.1). Electrical Supply and Safety.

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Electrical and MHE Issues

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  1. Electrical and MHE Issues

  2. Allocation of Electrical Categories

  3. Summary of Electrical Categories • Category A: Explosive gases present • Category B: Explosive Dust • Category C: Explosives, but no vapour/dust • Category D: Small quantities (except HD 1.1)

  4. Electrical Supply and Safety • External Power Supply: • Depending on voltage: • Public Traffic Route Distance, or • Inhabited Building Distance • Internal (site) Power Supply: • No overhead cables within 15m of buildings • Use underground cables (but not under buildings) • Surge protection devices • Set distances for type of generating plant

  5. Electrostatic Precautions • Static electricity: Sources (and mitigation example): • People (eg anti-static shoes and floor) • Equipment (wheels made of antistatic material) • Work benches (500mm from walls, and earthed) • Racks (500mm from walls and ceiling, and earthed) • Relative Humidity (RH) (Correct RH in room, conditioning of ammunition, sensors) • IATG 05:40 - extensive detail on this topic

  6. Lightening Protection • Low probability but severe consequence • Lightening Protection Systems (LPS) • External – eg Faraday Cage • Internal – eg Equipotential Bonding • Thunderstorm monitoring system • Evacuation Procedure

  7. Vehicles Permitted in Categorised Areas

  8. Vehicles Permitted to Enter a PES • Electrically operated vehicles • Diesel • Petrol engines • LPG, butane or propane powered vehicles

  9. ‘Standard’ Vehicles in a PES • Permitted in a Category ‘C’ area, holding yard or marshalling yard if: • Vehicle inspected to ensure no defects before entering the explosives area • Area licensed for storage and handling only • No ammunition processing in the area • Stop engine before loading and restart after loading • Loading/unloading by suitable MHE for the PES • If vehicle emits sparks, stop engine, offload packages

  10. ‘Standard’ Vehicles in an Explosives Area but not in a PES • Emergency vehicles permitted • Privately owned vehicles permitted if: • Necessary to move staff around the site • Privately owned vehicles have a fire extinguisher • No increased fire risk from vehicle • Written authority to use the vehicle • Not allowed into PES • Contractors vehicles and MHE permitted: • Meet IATG 05:50, or… use further control measures

  11. Management and Control of MHE • Serviceability • Maintenance and testing • Equipment breakdowns • Speed limits • Parked vehicles • Refuelling of MHE • Ventilation in buildings • Battery charging and maintenance

  12. Questions

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