It transpired that the three phase fuse box had two of its phases disconnected at both ends so effectively instead of the original 3 x 40amp fuses everything was being supplied through a single 40amp fuse.

Ha! Now that makes me wonder if the supply and metering has been changed to single phase to save some money.  If that is the incomer I agree it is pretty mean - actually 3 phase at 40A each is only a large-ish house in those parts of the Europe that use electric heaters, and not that far in KVA from the 100A single phase supply one finds in the meter cupboards of all-electric  housing estates here. (our scout HQ for example is 3 100A phases, and its not exactly big stuff.)

I think in your shoes I'd be looking for a more suitable venue, or factoring the cost of a hired genset  and  cables and trying to negotiate the price down. (and/or get them to fit a 3 phase event socket near the incomer- whcih needs to be suitable rated.) (a hundred KVA of self contained genset with bunded tank can be not much more than a horsebox size trailer)

I really do not think you have the authority to legally force their hand, but there is an argument for attacking the more sensitive organ, (the wallet) instead.

Mike.

It transpired that the three phase fuse box had two of its phases disconnected at both ends so effectively instead of the original 3 x 40amp fuses everything was being supplied through a single 40amp fuse.

Ha! Now that makes me wonder if the supply and metering has been changed to single phase to save some money.  If that is the incomer I agree it is pretty mean - actually 3 phase at 40A each is only a large-ish house in those parts of the Europe that use electric heaters, and not that far in KVA from the 100A single phase supply one finds in the meter cupboards of all-electric  housing estates here. (our scout HQ for example is 3 100A phases, and its not exactly big stuff.)

I think in your shoes I'd be looking for a more suitable venue, or factoring the cost of a hired genset  and  cables and trying to negotiate the price down. (and/or get them to fit a 3 phase event socket near the incomer- whcih needs to be suitable rated.) (a hundred KVA of self contained genset with bunded tank can be not much more than a horsebox size trailer)

I really do not think you have the authority to legally force their hand, but there is an argument for attacking the more sensitive organ, (the wallet) instead.

Mike.

Unfortunately there appears to be only two venues in the locality that have sufficient capacity for the attendees. The other venue has little in the way of accessible power and again is limited to islands of 32amp. I have had varying answers as whether there are multiple circuits or they are all part of the same ring main. This other venue was also subject to random trips although these were MCBs  that could be reset - not helpful when you find the beer coolers have been off since the previous night.

The Guildhall appears to have the power as there are extensive cooking facilities / industrial sized freezers. A big problem is the complete lack of documentation - hence the difficulty locating the fault.

I would like to see a power plan submitted that takes into account the total power required for all the coolers, fridges and air conditioning units (broken down by room). I would also like to have this is a binding contract with penalty clauses.

Ideally a separate genset and we are the masters of our own power.