"Pablo" wrote | Do the regs allow two DBs to be connected in parallel protected | by only one mcb. | i.e. a cable feeds DB1 then another cable goes from DB1 to DB2 | but connected directly to the feed for DB1. | I've looked in the regs but cant seem to find anything that prohibits it.
It's a very common arrangement both domestically (where the supply from the meter is split by a 'henley block' to feed to CUs and industrially - quite often DBs will be supplied on a ring main.
Obviously both short-circuit and overload protection have to be adequate, and I think you'd have problems looping the cable in and out of your DB1 unless its terminals are designed physically (and rated electrically) to accommodate it.
Owain