J
Jonny66
Hi,
Need some advice regarding the installation of an automatic change-over switch to protect the supply to a small commercial server room with two cabinets.
The building has a three-phase TNS supply, and at present, the sub main supplying server room DB is a single phase 3 core SWA (L/N/CPC) protected by a single phase fused switch at mains intake.
To protect the server room supply the client has suggested that an automatic C/O switch be installed, in conjunction with a UPS system that the client will arrange. I have been asked to source and install an auto C/O switch utilizing two phases, but have never installed one of these. So before I agree to price and take this on thought it would be wise to ask you knowledgeable people, your views on the following.
1. Mounting an auto C/O switch at the mains intake, upstream of the single phase switch fuse, i.e Henley L1, L2 , N (and CPC from MET) and take these tails (<3m) into C/O switch - then take single phase & N (& CPC) from load side of C/O switch into a fused switch and use the existing <8m long sub-main to server room DB .
2. Having never wired one of these (will discuss with manufacturer) but was wondering - as the neutral would not need to be switched with the phases should I be sourcing a two pole C/O switch (two phases switched) and N in solid link . To be honest I would like to know what was the general set up inside one of these, regarding terminals etc…?
3. Have read that the auto change over of phases can be quick at around 0.5 sec and as such, would this change over speed bring in the UPS?
4. Finally, have also read that voltage free contacts can be installed into auto C/O switch and are used to send a signal to a UPS system, could someone explain whether these are always needed.
Hope this makes some sort of sense
Thanks in advance
Jon
Need some advice regarding the installation of an automatic change-over switch to protect the supply to a small commercial server room with two cabinets.
The building has a three-phase TNS supply, and at present, the sub main supplying server room DB is a single phase 3 core SWA (L/N/CPC) protected by a single phase fused switch at mains intake.
To protect the server room supply the client has suggested that an automatic C/O switch be installed, in conjunction with a UPS system that the client will arrange. I have been asked to source and install an auto C/O switch utilizing two phases, but have never installed one of these. So before I agree to price and take this on thought it would be wise to ask you knowledgeable people, your views on the following.
1. Mounting an auto C/O switch at the mains intake, upstream of the single phase switch fuse, i.e Henley L1, L2 , N (and CPC from MET) and take these tails (<3m) into C/O switch - then take single phase & N (& CPC) from load side of C/O switch into a fused switch and use the existing <8m long sub-main to server room DB .
2. Having never wired one of these (will discuss with manufacturer) but was wondering - as the neutral would not need to be switched with the phases should I be sourcing a two pole C/O switch (two phases switched) and N in solid link . To be honest I would like to know what was the general set up inside one of these, regarding terminals etc…?
3. Have read that the auto change over of phases can be quick at around 0.5 sec and as such, would this change over speed bring in the UPS?
4. Finally, have also read that voltage free contacts can be installed into auto C/O switch and are used to send a signal to a UPS system, could someone explain whether these are always needed.
Hope this makes some sort of sense
Thanks in advance
Jon
