Symbology of single line diagram in british standard BS 7671.2018

Single line diagrams generally where all the conductors of a circuit are represented by a single line - so it shows what things are connected, but omits the detail of how they are connected. If you like it shows only cables, not individual wires.

As for other symbols on those diagrams, that rather depends on the context - a simple rectangle for example could represent anything from a joint box to a building - in some cases common electronic symbols (e.g. batteries or inverters) could appear - but often you need to refer to labelling or a key or the surrounding context to work out what represents exactly what.

   - Andy.

What do you need to know? The IEC 60617 symbols that are used on diagrams? Whilst to get the "originals" might be a subscription to IEC, there are publications that include them.

Some of them, however, are 'by custom and practice' used incorrectly, especially electrical/telecomms outlets on "floor plan" layouts.

I need to convert some single line diagrams into BS7671 single line diagrams. 

Actually I need to convert some single line diagrams into British standard.

1 image is attached for example

I don't think BS 7671 has any peculiar demands for line diagrams .. just that any symbols used comply with IEC 60617 and generally 'all diagrams, charts, and information or instruction notices' to comply with BS EN 61082-1, BS EN IEC/IEEE 82079-1 and/or BS EN 81346-1, as appropriate (BS 7671 519.9.2).

   - Andy.

As Andy says, the standards to follow are listed in Section 514 of BS 7671.

AJJewsbury said:

BS EN 61082-1

That is the basic standard for electrotechnical diagrams/documentation.

AJJewsbury said:

IEC 60617

That is the standard for symbols.

Regards the sample you posted, looks pretty 'standard' to me ... just to note that we no longer use 'R', 'Y' and 'B' for phases (they should have been abbreviated  'RD', 'YE' and 'BU' according to the standard colour code anyway) ... we use 'L1', 'L2' and 'L3' instead.

Table 51.1 of BS 7671 has the colour codes and conductor abbreviations we use, if that helps.