When  you say the circuit has failed - what exactly has happened - has the trip popped and refused to reset, has the driver stopped creating an output, has something actually gone bang  ?

Does it recover if taken indoors and warmed up for a couple of hours ?

My money on anything outside failing is usually water ingress or condensation due to hot/cold cycles. Have you done any kind of autopsy on the failed units?

Looking at the data for connect pro there are a number of variants, many of which seem to be double insulated 230V dasiy chain - so I presume its not those. Do you have data for the exact model as I cant see any mention of flash bulbs ?

Mike.

The product is MV002 - ten metre string with flash bulb.

As a product they are good VFM - especially on a business account rate !

It is double insulated 230 V - IP65 which is better than most on the ingress rating i reckon.   The sheath is HO3 which is just ok imho.

Further investigation points toward sheath failure on products in the quayside area where the wind was at its most strength. We use 316 stainless catenary to stop the chance of rust crystal chafing.

Further into the town area the product sheath is intact.

There were a number of whole town supply failures on Saturday - one for three hours. One phase on Sunday was causing a lot of problems with erratic voltages. At 1630 on time the MV002 products were off but all other products from same company worked and continue to do so.

I guess the question is how do the flash lamps work/fail ? 

Onward to today and 1200 metres of replacement ( non flash) have been ordered for installing this weekend.   At least it will be dry but cold !

OK well there is not a lot of paperwork is there!
I am assuming that as the LEDs will have a voltage drop of a couple of volts each, all in any short stringette are in series, so the 'flash' bulb has to break that, while the mains sails past to the next segment. but it is just a guess.
PDF

OK well there is not a lot of paperwork is there!
I am assuming that as the LEDs will have a voltage drop of a couple of volts each, all in any short stringette are in series, so the 'flash' bulb has to break that, while the mains sails past to the next segment. but it is just a guess.
PDF