hot tub fault tripping after switching on

[ruston]

Sorry for asking the obvious, you never know when you might get a dodgy one.

 

[marc8]

Sorry for asking the obvious, you never know when you might get a dodgy one.

not a problem was worth a check, I had just run in the new supply myself & tested.

 

[seltechpc]

You could clamp the L and N and monitor till it trips, you can see leakage current start to rise at it heats up or the pump cuts in.

 

[LankyWill]

Could there be an issue with true earth and supplier earth? the leakage could be offsetting the RCD? We had to put an earth mat in when we installed one.

 

[Pete999]

Well if you are getting those sort of insulation resistance readings it no wonder the tub is tripping out. What is actually tripping CB or RCD?

What 400 ohms

 

[Pete999]

What 400 ohms

Sorry mis read the OP didn't see the M after 400, reminder go to specsavers

 

[Pete999]

Hi Pete
VIR
230 V
10.3 I
23.3 R
sorry am I having a blond moment heater is 2.5kw.

400M ohms IR test to earth good
23.3 ohms heater continuity
did you spot something that in the above that I may have missed ?

No Marc I misread your post, thought you had said you had measured 400 ohms IR missed the dirty great capital M, sorry for any confusion

 

[UNG]

What make is the tub and the control equipment?

 

[marc8]

What make is the tub and the control equipment?

hi think it was Aqua spa but will check when I go back thanks, probably tomorrow if the rain stops

 

[marc8]

No Marc I misread your post, thought you had said you had measured 400 ohms IR missed the dirty great capital M, sorry for any confusion

no problem, I thought I had missed something really obvious

 

[UNG]

Just re read the OP and noticed it is second hand do you know what chemicals the previous owner has been using, if it was chlorine then you may find that a seal has rotted and leaking water into something when it is running
Bromine is much more friendly and doesn't cause as much damage as chlorine

 

[marc8]

Just re read the OP and noticed it is second hand do you know what chemicals the previous owner has been using, if it was chlorine then you may find that a seal has rotted and leaking water into something when it is running
Bromine is much more friendly and doesn't cause as much damage as chlorine

thanks will ask tomorrow when I am going round to take a look at the rest

 

[marc8]

Hi all
Well back today electrically disconnected heater from tub & installed link through fused spur to heater, turned on heater working but with earth clamp round L/N supply to tub 50.1ma whilst heater on.
So my guess although heater unit is heating & the IR test 400M ohm to earth & continuity of element 23.3 ohms.
The heater still has a problem any other ideas would be welcome before I swap heater unit ?

 

[Specialist]

Personally I'd make sure there was plenty of water in it & then let it run for a couple of hours to let the element boil the moisture off. Just keep a close eye on it & monitor the leakage current.

 

[marc8]

On now 60.1ma
Boiling it up can hear the sizzle & by natural heat trying to push water around

 

[marc8]

30 mins in 87.5ma

 

[telectrix]

30 mins in 87.5ma

at this rate you'll soon be able to boil a kettle on the leakage current.

 

[marc8]

at this rate you'll soon be able to boil a kettle on the leakage current.

Hi telectrix
Well heater is nice & hot but leakage is not so good at the tub at 87.7ma

 

[marc8]

might be new heater next week

 

[Specialist]

Expected it to go up first & then start dropping.
A few years back, I had a call to look at a Commercial cooker that had been stored in a garage for months while waiting to be installed.
When it was installed in the old peoples home, it tripped out when the oven was used.
Sparky on site disconnected & Meggered, no fault found. But it still tripped the RCD, So I got sent to look at it. I disconnected the oven elements & made up a cable to go to a non RCD supply & left it run, after a few minutes I tested the element & found leakage to Earth. We let it sit & cook while monitoring it, took over 4 hours before it was OK to use.
Has the increase in leakage started to level off yet ?