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Separate Switch Disconnector enclosure

fiftyhertz
Morning All, 


Why would you use a separate switch disconnector enclosure ie Schneider SEA9PNI2504, the vast majority of distriubtion boards i see have an incomer device at the base of the busbar, which could also be used as a protective device. Never really understood why a separate unit would be required?


Is there a practical reason im missing.


Thanks
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    Modern distribution boards often do a superb job in shielding live parts, including those associated with the incoming device. However, in certain quarters even with such shielding, the risk is not mitigated to an acceptable level and they require the complete assembly to be safely isolated before accessing for maintenance. Making off a swa in to a distribution board could have those long bare wires contact the supply terminals even though the tunnels are fairly small. I know, for it happened to one of my guys, luckily without injury!
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  • 0
    Modern distribution boards often do a superb job in shielding live parts, including those associated with the incoming device. However, in certain quarters even with such shielding, the risk is not mitigated to an acceptable level and they require the complete assembly to be safely isolated before accessing for maintenance. Making off a swa in to a distribution board could have those long bare wires contact the supply terminals even though the tunnels are fairly small. I know, for it happened to one of my guys, luckily without injury!
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