MAIN SWITCH BOARD (MSB) SAFETIES

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  • MSB to be installed on the raised platform.
  • The location where the MSB is installed should have good ventilation, illumination & affected by minimum vibration.
  • No water or the oil pipes should pass above the MSB.
  • There should be an adequate space around the MSB allowing comfortable operation & maintenance.
  • The operating floor space in front & behind of the MSB should be covered with an anti skid, insulated rubber mats with a minimum thickness of  about 15 mm.
  • Panel doors should be in the locked position.
  • Door opening mechanism should be interlocked with the power supply.
  • The enclosure should be drip proof.
  • MSB should be dead front type. (i.e. All the live conductor should pass behind MSB)
  • Every equipment onboard must be properly earthed & also MSB must be properly earthed.
  • Every incoming & outgoing feed must be protected by a switch fuse or the circuit breaker.
  • Insulation resistance should not be less than(<) 1 Mega Ohm in any case. Insulation Resistance (IR) to be checked & records are maintained.
  • All meters must be calibrated periodically & records are maintained.
  • All the meters, switches, fuses, push button, indicating lamps, etc. should be in working condition & identified with individual name plate or tag.
  • All the interlocks must be in the working condition.
  • Operating switch gear, tools such as the circuit breaker handle, fuse puller, lamp grip, etc. must be readily available & to be used.
  • Red tag / name plate indicating high voltage & danger sign should be fitted
  • Appropriate ready to use fire extinguishers should be positioned nearby. (CO2 & DCP)
  • Charts indicating drill procedures in case of the electric shocks must be displayed near the MSB.
  • Wiring diagram of the equipment laminated or framed indicating supply system must be displayed nearby.
  • All the appropriate spares should be properly preserved & protected, individually packed & identified, & should be readily available for use.
  • Earth fault indication should be fitted & displayed in front of the panel.
  • 24 volt battery supply emergency light should be provided near the MSB.