Yes its volt-amps. A common way to express TRX outputs. You can nominally say 50VA will run up-to 50w of 12v downlighters within a reasonably short cable run, so you should check the wattage on the lamps and see if you've been overdriving it. There are 75w lamps available and consumers tend to want the brightest ones they can get without considering their power supply.Sput wrote:I think you're spot on, although it's all on top of cupboards with a big closed terminal block first because there's a (11 year old) transformer for each cupboard unit. It looks fairly neat but within that box, who knows!
While I'm on the topic: I see the transformer's rated at 50VA output, as in volt-amps? As in Watts? What an odd way to write it, if so.
Anyway, ta for your lovely advice. I'll take all the bulbs out at some point then call the landlord if it still trips.
(Pay a little extra on the Phillips line of Dichroic reflector lamps - their 20w lamp has such an accurately faceted reflector it pushes out more candle power than some cheaper 50w lamps. True story.)
While the RCD is tripped you could whip the back off the junction box. There will be a mains tail in splitting through connector block to however many TRXs are in-line. The obvious way to connect a few items is for the wires to be twisted together and pushed into a terminal block. This is often where one of the cores will have slipped out between the others. Pushing against the wires with an insulated screwdriver should quickly identify something loose.
Take the lamps out before you do anything else. Reset the breaker and try one fitting at a time.
