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Electrical and MHE Issues

This document summarizes the allocation of electrical categories related to hazardous environments, detailing safety measures for various explosive scenarios. It covers essential topics like power supply regulations, electrostatic precautions, lightning protection systems, and the management of mobile handling equipment (MHE) within categorized explosive areas. Specific vehicle guidelines, maintenance protocols, and safety practices are also highlighted to ensure compliance and minimize risk. Adhering to these practices ensures a safer operational environment.

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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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