Good evening folks, still a few familiar names on here so this should be an interesting discussion…,
More and more over the last few years I find myself in product production and the realms of ‘Placing on the market’ electrical equipment .
The sticking points are getting stickier with the advent of new technologies, systems and integrations.
So to dig straight in…
In the case of Solar & Battery installations BS7671 applies.
In the case of Switchgear BS EN 61439 applies.
In the case of machinery and associated control panels BS EN 60204 applies.
If we are building a product it will need certification CE/UKCA etc.
We need to choose the appropriate harmonised standard(s) / Directives etc.
BS7671 it isn’t a product standard and does not apply to ‘products’ that said it still has relevance in that there is little point placing a product on the market that fails to satisfy it’s requirements for installation.
I find cable colours are often a bone of contention with many.
We are all familiar with the standard colour codes in BS7671.
Battery systems are in the main Red - Black - though German vehicle manufacturers now seem to use Brown for negative ground and just about anything for the rest.
MCS now list Solar PV as Red + White -
BS EN 60204 has the following colour codes for presumption of compliance.
AC and DC Power Circuits
AC Phase and DC + / - : Black
AC Neutral : Light Blue
AC and DC Control Circuits
AC Live or Neutral via transformer : Red
AC Neutral Light : Blue
DC + – : Blue
Interlocks control circuits supplied from an external power source or remote panel : Orange
Panel Services Colour Coding (multicore)
Colour Coding for Panel Services (Single Core)
AC Live : Orange
AC Neutral : Light Blue
So to the conundrum….
You build a panel (Product) that falls under the machinery directive as a result of its intended use and connected systems, BS EN 60204 supports the use of switchgear within such panels, The panel also has connection for PV array(s) and houses associated sealed battery storage
As a result, there are multiple standards, both harmonised for product certification and otherwise.
Black might be
AC Live of any phase
DC + or -
Red might be 12/24/48v DC +
1500v DC + from a Solar array
Any AC voltage derived from a Transformer etc etc
It quickly becomes apparent that no one standard fits.
If 60204 is chosen as the ‘Primary’ standard that would preclude the use of Red for Battery systems for example.
I realise we can build and certify anything as-long we are willing to certify and accept the risk in the product as the manufacturer.
Most electricians that I talk to just build their own panels and tend not to bother with the certification, however if we are to build and supply to 3rd parties that ‘luxury’ is not an option we can afford.
From the point of view of installing the panel, we can utilise the outward facing terminals standards, essentially this turns it in to painting by numbers for the installer.
Really I am thinking more along the lines of maintenance and the person(s) who have to work on it in the future.
How much reliance can we place on documentation and labelling vs conventional knowledge of electricians?
I remember Paul Skyrme once telling me if they dont know the colour codes they might be better stacking Tesco’s shelves, I understood the sentiment but how far and how much protection would this really offer in a fatality due to mis identification of cabling?
Apologies if this is a little rambling, it’s a reflection of my mind right now on this subject!
Thanks
Martyn
