3 Phase or Single Phase?

[greenspark]

Just wondered for the purpose of form filling:
I went to a farm property today to verify supply data and had to mark whether it is 1 or 3 Phase.
It has a 3 Phase Supply to the property although only the Yellow Phase is being used to supply the whole installation. This is done in the form of a Connector Block on the outgoing yellow meter tail, used to derive multiple supplies to associated Consumer Units on the property.

 

[telectrix]

if there are no fuses in the red and blue phase cut-outs, then i would mark it down a single phase.

 

[mike2790]

i seen that alot in the isle of man where a 3 phase service head had been used for single phase supplys, sometimes 2 phase and neutral were used, just count the number of phases that are being used and note that.