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Hi guys, hopefully someones going to be able to point me in the right direction here.
We do a lot of work for a small retirement home locally that has recently decided to fit lightning protection. We've pretty much been strong armed into fitting SPD's on behalf of the lightning firm (LF). Being honest I don't have a great deal of experience with them and tried to sidestep the job. No such luck!
The lightning firm(LF) are supplying SPD's, but have supplied little further information. What they have provided seems inconsistent and vague. IMO they don't really seem to 100% know what they are talking about.
1.We have a 3 phase SPD to be fitted at the main intake position. There is a 3 phase DB here, but it has no spare ways. LF have said we need to split the tails and fit a 3 phase switchfuse isolator before connecting to SPD in adjacent enclosure.
2.We have 2x SWA cables running external around the building which we are told need SPD's at the load end. These supply a 3 phase washing machine and a 3 phase cooker (20A each). LF have been pretty vague here and sometimes use the word 'isolator' and sometimes 'switchfuse' and don't appear to know the difference. They want us to cut into the SWA before the existing appliance isolator and fit a 63A switchfuse (or isolator - who knows). This would isolate the SPD.
I'm not sure why 63A has been specified?
I'm not sure if I need to fit a switchfuse or an isolator? I'm not even sure what would stop someone turning it off by accident?
If I cut into the SWA at the load end I'm going to need to double up the cables in the supply side of the isolator - doesn't seem like the greatest design?
Can anybody offer some help/point me in the right direction here. I don't like just blindly following instructions that don't make sense to me.
Cheers
We do a lot of work for a small retirement home locally that has recently decided to fit lightning protection. We've pretty much been strong armed into fitting SPD's on behalf of the lightning firm (LF). Being honest I don't have a great deal of experience with them and tried to sidestep the job. No such luck!
The lightning firm(LF) are supplying SPD's, but have supplied little further information. What they have provided seems inconsistent and vague. IMO they don't really seem to 100% know what they are talking about.
1.We have a 3 phase SPD to be fitted at the main intake position. There is a 3 phase DB here, but it has no spare ways. LF have said we need to split the tails and fit a 3 phase switchfuse isolator before connecting to SPD in adjacent enclosure.
2.We have 2x SWA cables running external around the building which we are told need SPD's at the load end. These supply a 3 phase washing machine and a 3 phase cooker (20A each). LF have been pretty vague here and sometimes use the word 'isolator' and sometimes 'switchfuse' and don't appear to know the difference. They want us to cut into the SWA before the existing appliance isolator and fit a 63A switchfuse (or isolator - who knows). This would isolate the SPD.
I'm not sure why 63A has been specified?
I'm not sure if I need to fit a switchfuse or an isolator? I'm not even sure what would stop someone turning it off by accident?
If I cut into the SWA at the load end I'm going to need to double up the cables in the supply side of the isolator - doesn't seem like the greatest design?
Can anybody offer some help/point me in the right direction here. I don't like just blindly following instructions that don't make sense to me.
Cheers