Sy feeding school boilers.

rugbylad · Jul 25, 2018

What is people’s views on using SY cable?
I’m not keen on using it for fixed wiring.

westward10 · Jul 25, 2018

Don't then.

sinewove · Jul 25, 2018

westward10 said:
Don't then.

Its banned in the OSG,but the AC brigade seem to love using it outdoor and in.Regards.

LankyWill · Jul 25, 2018

I prefer adapter flex on conduit for large boilers looks better than flimsy SY, wouldnt loose sleep over it mind.

westward10 · Jul 25, 2018

sinewove said:
Its banned in the OSG,but the AC brigade seem to love using it outdoor and in.Regards.

It states it is banned?

rapparee · Jul 25, 2018

I'd rather use H07RN

sinewove · Jul 25, 2018

westward10 said:
It states it is banned?

Think it says something like not recognised by British standards for use over here,but used a lot in Germany apparently.

Adam W · Jul 25, 2018

sinewove said:
Think it says something like not recognised by British standards for use over here,but used a lot in Germany apparently.

So it isn't "banned" then - a departure at worst.

jamie-spark · Jul 25, 2018

Personally I think it looks ruff. Each to their own though

Interestingly , Eland cables now has a BSI kitemark on it now and other flexible cables

Veriflex Cable | Eland Cables - https://www.elandcables.com/veriflex?gclid=EAIaIQobChMIo_Xth_-63AIVA7ftCh3lLAfNEAAYASAAEgKtW_D_BwE&gclid=EAIaIQobChMIo_Xth_-63AIVA7ftCh3lLAfNEAAYASAAEgKtW_D_BwE

MJPD29 · Jul 25, 2018

You gland a fixed sy to a motor in the AM2 exam, and I personally see no issues with it providing it is glanded correctly

westward10 · Jul 25, 2018

Do they tell you how to ensure the braid can carry fault current.

rapparee · Jul 25, 2018

westward10 said:
Do they tell you how to ensure the braid can carry fault current.

It's not for carrying fault current it is to combat harmonics from VDSs etc

Spoon · Jul 25, 2018

All the SY cables I see now have a "Not suitable for fixed wiring" in the spec. Like the Eland cable in the above post.

westward10 · Jul 26, 2018

rapparee said:
It's not for carrying fault current it is to combat harmonics from VDSs etc

As soon as someone earths it there is a possibility it will carry fault current.

rugbylad · Jul 26, 2018

I’ve not done it nor am I going to, just doing some remedial works on a school and thought I’d pop into the boiler house, seen some SY, thought I’d get your guys input.

mydigitalhome · Jul 26, 2018

Thats what your departures section is for on your certificate if you are the designer and you feel that is suitable - not based on price - cheap is not always best, then you can use it. Write down why you have taken decision for it use and be happy. As you say miles of it has been installed without issue enjoying its properites.

Spoon · Jul 26, 2018

mydigitalhome said:
Thats what your departures section is for on your certificate if you are the designer and you feel that is suitable - not based on price - cheap is not always best, then you can use it. Write down why you have taken decision for it use and be happy. As you say miles of it has been installed without issue enjoying its properites.

It is only recently that they have started putting "Not suitable for fixed wiring" in the specs.

mydigitalhome · Jul 29, 2018

Hi, its to do with the BS for fixed wiring and a different one for SY cable from memory. I'm sure someone on here can remember the actual regs involved. It may come to me once i've had another Brandy worth trying anyway.

mydigitalhome · Jul 29, 2018

Thinking could consider H07ZZ-F as its a heavy duty, halogen-free, harmonized, and flexible multi conductor cable as alternative flexible cable. Interesting to see what the cost would be as an alternative. Worth speaking with their tech. line as to its suitability.

Deleted member 26818 · Jul 30, 2018

Not sure that using SY to connect boilers would fall under BS7671.
Yes if it were used to feed the isolator, but from the isolator to the boiler no.

Ian1981 · Jul 30, 2018

spinlondon said:
Not sure that using SY to connect boilers would fall under BS7671.
Yes if it were used to feed the isolator, but from the isolator to the boiler no.

I’d have thought the other way round no?
Fixed wiring being from the OCPD to the boiler isolation point?