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Sprinkler Pump Supplies

Former Community Member over 3 years ago

Hello, I have read in the Forums that a sprinkler pump has to be connected directly to the DNO supply so that if the building is isolated the sprinkler pump/life services systems aren't.

My question is that how do you rate the cable to the life services panel i.e. if the DNO protective device is a 1250A MCCB, does the life safety cable connection to the DNO supply have to be 1250A rated? Or can it be downrated to the actual load?

0 mapj1 over 3 years ago

I think you have mis-understood ‘directly’ - directly in the sense of via a fuse that is not shared with anything else may make the intention clearer - depends on the supply you need but for an example a 100A fuse would warrant a 100A main from that point onwards. The fuse may well need too be quite be oversized for the load by normal standards - if push comes to shove you may not care if the motor is running a bit hot, it just needs to keep running so a finely set overload protection is not needed or desirable.
Another similar discussion from a few years back that sets the tone
Mike
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0 Former Community Member over 3 years ago

Thanks Mike

So where there is a life safety switch panel with FF lift, sprinkler pump and smoke vent on it, does this mean that it is OK for the entire panel to be connected to a single incoming protective device, which in turn is connected the live side of the non essential board?

Or should each have it's own PD connected to the source?
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0 Former Community Member over 3 years ago

I would think it has to be connected to the main distribution panel via a non RCD type PD labeled accordingly and has Mike said solely for the use of the life safety system.
Regards TS
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Sprinkler Pump Supplies

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