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Wet Riser Pump back up supplies

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JameZZZ

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Refurb on an existing building where new wet risers are going in:

Where do changeover switches for back up supplies for wet riser pumps have to be installed? Can they be installed at the main switchboar with a single cable to each pump or does the changeover switch have to ne local to the pump with 2 supply cables? Where are there regs on this?

Also I have been told by fire specialist that the supply has to be able to take the locked rotor current of all fire pumps............I have been told that 2 x 75kw pumps are going in with a LRC of 900 amps each! This seems like an unfeasable requirement ( the existing substation which supplies the building is only 1000KVA). Does this also apply to the back-up generator? Has anyone had this thrown at them before?

Any insights are welcome. Thanks
 
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Thank you for taking the time to report back. When I ran the engineering for a strategic site I used parsons brickerhoff to calculate and select high current fuses and circuit breakers and ensure discrimination and trip settings for large motors. They had an electrical modelling tool which could take a design - cbs by make and setting, fuses by make and rating, cables by make and length, load by type and use profile, even ATSs, etcetera and do runs on it to show that an electrical design would perform as required. I used the London office but I note they have an office in Bristol too. Sorry I don't have a contact - it was 15 years ago. So if you design the installation they could do modelling on it and confirm all is well, or they can help you design, source components and test it.

Electrical engineering - http://www.wsp-pb.com/en/WSP-UK/What-We-Do/Services/All-Services-A-Z/Electrical-engineering/
 
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marconi said:
http://www.bafsa.org.uk/wp-content/uploads/bsk-pdf-manager/2017/06/BIF-21-Wet-Dry-Risers.pdf

Please see page 3 of 4 of the BAFSA document on wet riser pumps and their power supplies. It does not answer your question completely but there are some contact numbers at the end of it. If they don't know they might be able to direct you to someone who does.

Also IFEDA - the Independent Fire Engineering and Distributors Association.

See: ifeda.org

I'd have thought BS9990 has something to say on the matter.

Lastly: High rise wet riser fire systems installation | UK Dry Risers - http://www.ukdryrisers.co.uk/wet-riser-systems.php
Click to expand...
Snippets from BS990:2015

[ElectriciansForums.net] Wet Riser Pump back up supplies
[ElectriciansForums.net] Wet Riser Pump back up supplies
[ElectriciansForums.net] Wet Riser Pump back up supplies
 
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DPG said:
This thread is from 2017.
Click to expand...
Yep, you are right, I just joined today though........ The wiring and monitoring of fire pumps is what I do, have done for decades. My bible is TB 210, just trying to help any electricians out there who may not be familiar. The thread is still extant, isn't it?
 
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fulminator said:
Yep, you are right, I just joined today though........ The wiring and monitoring of fire pumps is what I do, have done for decades. My bible is TB 210, just trying to help any electricians out there who may not be familiar. The thread is still extant, isn't it?
Click to expand...
Thread isn't that old welcome to the forum diverse knowledge makes the forum what it is.
 
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fulminator said:
Yep, you are right, I just joined today though........ The wiring and monitoring of fire pumps is what I do, have done for decades. My bible is TB 210, just trying to help any electricians out there who may not be familiar. The thread is still extant, isn't it?
Click to expand...

Absolutely. Sorry, was just pointing out its age in case you weren't aware.

Welcome to the forum!
 
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DPG said:
This thread is from 2017.
Click to expand...
Interesting read though.

Here is a photo of a 2 pump set one electric the other diesel. The electric supply had huge fuses for the supply cable size, and no motor overload, just a star/delta starter. 250A FLC. Shame the pump supply cable had been stolen. The diesel pump was awesome. Though the waste storage building this was for was out of use and empty the engine had been serviced somewhat recently. As soon as the start button was pressed it EXPLODED into life, I've never seen a diesel engine start and reach full running speed so fast. You couldn't even hear the starter motors crank the engine it fired so fast. It was fitted with 2 sets of batteries and 2 starter motors for full redundancy, I believe it fired both starter motors together. The water supply tank had the largest ball cock I'd ever seen.

This set may have been scrapped with the rest of the equipment in the building :( It was one of the only things there that still worked. Plenty of water spraying out of the heads missing their bubbles!
[ElectriciansForums.net] Wet Riser Pump back up supplies
 
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fulminator said:
Yep, you are right, I just joined today though........ The wiring and monitoring of fire pumps is what I do, have done for decades. My bible is TB 210, just trying to help any electricians out there who may not be familiar. The thread is still extant, isn't it?
Click to expand...
Correct me if I'm wrong here but thr thread is on Wet Risers pumps, not Automatic Sprinkler pumps, I'm led to believe they are 2 different operating beasts?
 
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