Has anyone got a link/list to the standard identifiers used for control panel wiring & ferrule markings - like A1/A2 used for AC supply, C1 etc for CT's. I used to have a list somewhere from when I worked for the electrricity board but its gone walkies!

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From SMD's to 132kV... ive had a go!

Richard Talmage, LCGI EngTech TMIET

I have a condensed list that I typed out for HV switchgear. PM your e-mail address and I will send you a copy.

PM sent, Many thanks

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From SMD's to 132kV... ive had a go!

Richard Talmage, LCGI EngTech TMIET

The document you require is BEBS S12 (1964) which is available for purchase from the documentation section of the Energy Networks Association. However, this document has now been superceded by the ENA specification TS 50-19 (2004). This new specification is also available for purchase from the Energy Networks Association.

The standard gives a basis for wire numbering by use. It consists of a letter, followed by a two or three digit number and possibly a suffix of a further letter. As an example, a rough guide to the initial letters we use is:

A, B, C for protection class CTs
D for metering class CTs
E for VTs,
G for voltages used for confirming synchronisation of supplies
H for mains (230v / 400v ac), odd numbers being live, evens neutral.
J for DC supplies, with odd numbers being positive
K for controls (Circuit Breaker opens, closes, trips), with odd numbers being positive
L for indications and alarms, with odd numbers being positive
S for analogue transducers, with odd numbers being positive
T for pilot cables


Regards,

Alan.

Many thanks Alan, thats a great help, Thankyou.

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From SMD's to 132kV... ive had a go!

Richard Talmage, LCGI EngTech TMIET

Here are a few others that I have been using recently to add on to Alan's list.

F for reference voltage for voltage control
M for motor devices
N for tap-change control
P for DC tripping circuits used for busbar protection
U for spares
X for alarms and indications

There are also a few restrictions on the numbers used after the circuit function letter but these mainly apply to the CTs and VTs and the phases.

JC

Excellent, thankyou exactly what i was looking for. And thankyou Arthur for the email. On a slightly different note i remember now that A1/A2 etc is used on the terminals of relays/contactors along with the other terminal markings. Has anyone got a standard definition to these too?

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From SMD's to 132kV... ive had a go!

Richard Talmage, LCGI EngTech TMIET

A1 and A2 are the coil connections, if there is a second coil it will be B1 and B2
Contacts 1 &2 are normally closed contacts
3 & 4 are normally open
5 & 6 are timed
change over contacts are normally 1(common) 2NC 4NO
where there are more than one set of contacts they are prefaced with numbers ie a double pole NC relay would have contacts 11&12, 21&22.

The above is off the top of my head, I am sure I will be corrected if wrong.

Look at the online Moeller/Eaton wiring manual

http://www.moeller.net/en/support/wiring_manual.jsp

It shows sample circuits as well as symbols and symbol markings.