Hi PSTC Folk. Not a strictly EMC or Safety question, but could be...
European Automobile components such as relays, switches, etc. have terminal markings that are rather similar to the CENELEC markings found on relays etc. used on many switching components used in Europe. CENELEC markings have the first digit as 'contact group number' and the second number to describe function, i.e. 1-2 = NC, 3-4 = NO, 5-6 = 'special function' NC. and 7-8 = 'Special function' NO, such tht contacts on a relay may be 11-12, 21-22, 33-34, 43-44, and delay close contacts be 57-58, etc. But the similar markings on Automobile components have, on single contact components, numbers such as 80, 80a, 30.... and so on, which seem to be out of line with the 'rules'. Can anyone enlighten me as to where these component markings originate, I'm sure they are rooted in DIN somewhere, but a standard number or document reference would be nice. Many thanks Chris Duprés Consulting Engineer Surrey, UK.
