Discuss Block of 200+ flats, eleven single channel hot water timers blown this week alone. in the UK Electrical Forum area at ElectriciansForums.net
Following MJ’s theme - MOVs do degrade each time they react to over voltages. It is not unknown for them to eventually suffer thermal runaway which is when their quiescent current rises over time, the MOV warms up, its resistance reduces, it passes more current, it warms up even more…until it cannot dissipate the heat quickly enough to its surroundings and it destructs. All of which can happen in the absence of any overvoltage.Don't think it's been asked, but did all eleven flats loose their timers at the same time, or was it cumulative over a period.
That is a good question but impossible to get a definitive answer as we don't know when they "went" only when the tenant discovered and reported them.Don't think it's been asked, but did all eleven flats loose their timers at the same time, or was it cumulative over a period.
But judging by the crazy disco lights I witnessed the issue is still ongoing and more will go.
Somebody needs to switch this lot off now.
Time to get the Megger out and 1000v dc @ the heater could be cable or heater.They are rated at 16A. The hot water cylinders are on a dedicated circuit off their own 16A MCB, isolated via a 20A double pole switch, length is a couple of meters.
Couldn't see a rating on the element but looking into that now.
Edit to add,
The elements are 3kW but looking at the plumbing I think they're on a central hot water system as there seems to be a coil on the cylinders.
I'm back there tonight two replace a couple and grab some more info.
Sorry wrong postTime to get the Megger out and 1000v dc @ the heater could be cable or heater.
Reply to Block of 200+ flats, eleven single channel hot water timers blown this week alone. in the UK Electrical Forum area at ElectriciansForums.net
We get it, advertisements are annoying!
Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.