Chris Pearson:
Well, you cannot have two circuits supplying the same luminaire, but you could have two switches on the same circuit supplying it.
If you put small groups of luminaires on a number of grid switches (say, eight) there is nothing to stop you from turning them on in whichever combination suits the circumstances at the time. Heck, you could even switch each one individually if you wanted to!
The live and neutral (there is no earth lead off the connector block) to the actual luminaire are by default connected to N and 1 in the connector block. If I am only looping in and out of the connector block with the other conductors presumably this wouldnt count as supplying the luminaire with two circuits as the connector block is effectively a junction box?
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