RCD types

Is it just me or are RCD types starting to get silly. After the EVSE discussion I've looked at the data sheets for a couple of manufacturers and collected the following list of RCD types:

• AC

• A

• A EV

• A KV

• U

• F

• B

• Bfq

• B+

• B NK

• B SK

• R (for x-ray/CAT supplies)

Plus 'delay' types of:

• (none) - instantaneous

• G short delay (10ms)

• S proper delay/selective

I suspect type U might now be obsolete, and  Bfq and B+ from one manufacturer might be the same/similar as B NK and B SK from another, but it's starting to smack of people just making things up as they go along.


Anyone found any more?


   - Andy.