Amendment 3 DPC

[D Skelton]

http://www.voltimum.co.uk/sites/www.voltimum.co.uk/files/bs7671-amd-3-dcp_0.pdf

Some interesting changes, some are bloody pointless though IMHO.

 

[Jay Sparks]

Thanks for the PDF DS. Just had a quick scan through it but gonna give it a proper read later. When is this new amendment due to come out?

Jay

 

[D Skelton]

1st of Jan 2015, in full effect by 1st of July 2015

Just another bloody regs book really innit, all because a few plebs up at the IET want to correct their spelling mistakes! lol

 

[Silly Sausage]

What's this all about?
(See 411.4 etc.)

Cmin is the minimum voltage factor to take account of voltage variations depending on time and place, changing
of transformer taps and other considerations.
NOTE 1: For a low voltage supply given in accordance with the Electricity Safety, Quality and Continuity Regulations
2002 as amended, Cmin is given the value 0.95.

 

[D Skelton]

Also, have a look at the altered tabulated max Zs values for B, C and D curve 60898s!

What a ball ache, that means the big green book is gonna have to come out every time I fill in a cert now!

 

[spark 68]

This is to take account of the lower end of the range of the tolerances and VD of a nominal 230V/400 supply, if you notice they have also re-calculated the max Zs values (OCPD tables etc.) to take this into account too.

What gets me with this is that they already lowered these once to "harmonise" the 230/400 calcs (from 240/415), this new lowering probably makes some sense if you have a "real" 230/400 supply which we don't (we only changed the tolerance band) unless we are really lowering our supply voltage this time ?

More significantly, the commercial/industrial supervised person "get out clause" for RCDs has all but been removed, unless you are prepared to sign a RA to say otherwise, I cannot see many people wanting to sign that.
This will cause some problems with offices and the like.

Where does all this Bull Shine end ?, yet they do nothing to correct all the other anomalies and poor wording of existing regs, just add more Sh*t on top, was the 17th that bad ?

More money for "the boys", I wish we would tell Europe to P*ss off and fit in with us for a change.

 

[D Skelton]

This is to take account of the lower end of the range of the tolerances and VD of a nominal 230V/400 supply, if you notice they have also re-calculated the max Zs values (OCPD tables etc.) to take this into account too.

What gets me with this is that they already lowered these once to "harmonise" the 230/400 calcs (from 240/415), this new lowering probably makes some sense if you have a "real" 230/400 supply which we don't (we only changed the tolerance band) unless we are really lowering our supply voltage this time ?

More significantly, the commercial/industrial supervised person "get out clause" for RCDs has all but been removed, unless you are prepared to sign a RA to say otherwise, I cannot see many people wanting to sign that.
This will cause some problems with offices and the like.

I bet DI EICs with RAs attached will be flying out of the printer! they do love a get out clause don't they!

 

[Octopus]

Is there ANY justification for this update?? Or is it time to fleece the spark again?

 

[spark 68]

To be honest D I am p*sed off with the whole lot, More books to be replaced, GNs etc. then we will sure to be having the 18th ed next, more costs for exams etc. IET and C&G on a good old money spinner, I know we have always had updates, mostly for the better, I agree with the 17th for RCDs in domestic for example, but this just takes the p*ss.

This is more to fit in with the poxy EU, it is more of a political change IMO, rather than for good Electrical reasons.

 

[Silly Sausage]

Also, have a look at the altered tabulated max Zs values for B, C and D curve 60898s!

What a ball ache, that means the big YELLOW book is gonna have to come out every time I fill in a cert now!

All the Z esses for all (it seems) devices are 5% lower.