Well without seeing what you have Jemmajones its hard to say. But it sounds about right, basically nobody but nobody makes any specialist split-phase gear so even the DNO will use a 3-phase cutout and only connect two-phases, they will also use use 3-phase concentric cable etc. The same goes for sparkys, there is no split-phase gear available now so the most common solution is to use 3-phase gear and blank off every L3 way in the DB.
The easiest way to check for splitphase is to look at your incoming 11KV supply like this :
http://upload.wikimedia.org/wikiped...Marchouse_Hill_-_geograph.org.uk_-_106798.jpg
Then i'm afraid you only have 2 of 3 phases present, how far away 3 phase is is anyones guess could be 500 yards, could be 3 miles or more.
If you have 3 11kv lines coming over you probably have 3 phase readuy to connect.
If it does happen, do the job properly and go the 3-phase DB route, you may have to get more RCBO's but balancing 3 single phase boards properly will be a living nightmare !
The easiest way to check for splitphase is to look at your incoming 11KV supply like this :
http://upload.wikimedia.org/wikiped...Marchouse_Hill_-_geograph.org.uk_-_106798.jpg
Then i'm afraid you only have 2 of 3 phases present, how far away 3 phase is is anyones guess could be 500 yards, could be 3 miles or more.
If you have 3 11kv lines coming over you probably have 3 phase readuy to connect.
If it does happen, do the job properly and go the 3-phase DB route, you may have to get more RCBO's but balancing 3 single phase boards properly will be a living nightmare !
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