disconected gas cooker

[Razor900]

Even so I am not convinced that a failed on FSD would be AR.

It would only be the same as having no FSD where it is now required and I expect there is a good argument for it to just be NCS.

Quite right Tony.

For exactly the same reason that it's ok to leave a boiler on if the safety devices fail to close the gas valve when they should.

What's the worst that can happen eh??

Errr I seem to remember there's a classification for defective safety devices, now what was it again???

 

[ianmcd]

Quite right Tony.

For exactly the same reason that it's ok to leave a boiler on if the safety devices fail to close the gas valve when they should.

What's the worst that can happen eh??

Errr I seem to remember there's a classification for defective safety devices, now what was it again???

Exactly Razor if an appliance is designed and fitted with FSDs then no matter where it is installed they must operate correctly regardless of the size of the customers bosom, or whether or not she is wearing a saree, and likes wine and dancing

 

[Agile]

The operation of the hob would be exactly the same as a non FFD one which is only NCS in the locations where required.

So why class it differently?

 

[Razor900]

The operation of the hob would be exactly the same as a non FFD one which is only NCS in the locations where required.

So why class it differently?

Try the GIUSP Edition 7.1, Subsection 9, paragraph 7.4

In fact the OP may well be due an apology. I didn't see the bit about the failed FSD's

But he was still wrong it should have been ID

 

[picasso]

If it has been designed with a safety device then it has to work.

 

[Dan Robinson]

Tony knows better than all these bodies in charge of safety as well as the manufacturers with millions invested in product R&D.

Although I'm still not convinced the OP correctly identified FSD's.

 

[Razor900]

Poor Tony won't have any threads left to post on soon

 

[Steelmasons]

Poor Tony won't have any threads left to post on soon

 

[endecotp]

Do the FSDs require the electricity to be on?
It is odd that all of them seemed to have failed, so I wondered what common issue could affect all of them - and then remembered that the electricity was not connected and they were being lit with a match.
My guess was that the FSD would be purely mechanical but a google image search finds some with wires coming out of them. Still I'd hope that they would fail safe when the electricity is off. Well, except that if I had one I'd like to be able to cook during a power cut...

 

[Agile]

As far as I am aware all hob FSDs are simple thermocouples connected to magnetovalves.

They are self powered and need no external power.

They are basically the same system used on old permanent pilot light boilers.

 

[picasso]

The fsds are just miniature thermocouples and they don't need the electricity to be on to work, they work the same way a boiler thermocouple works you hold in the knob till the magnet energises and holds the gas valve open, blow out the gas and the magnet lets go and the gas goes out.

 

[FiremanT]

Are you saying the hob FSD failed to ON? Did you have to activate FSD (ie hold the knobs in) to get the hob to work?

Come on, Dibby. Lets have some answers
My money is on you not giving the hobs enough time to drop out

 

[Agile]

I agree.

Although I usually test them in situ by seeing if a flame is held on within a very short time, a second or so.

They react VERY quickly indeed! Few take more than three secs to stay on.

Testing them to off is probably a good idea as well. But if they test OK to on then I don't see them likely to fail when testing them to off.

 

[Steelmasons]

The operation of the hob would be exactly the same as a non FFD one which is only NCS in the locations where required.

So why class it differently?

 

[FiremanT]

I agree.

Although I usually test them in situ by seeing if a flame is held on within a very short time, a second or so.

They react VERY quickly indeed! Few take more than three secs to stay on.

Testing them to off is probably a good idea as well. But if they test OK to on then I don't see them likely to fail when testing them to off.

AFAIAC, that is not testing them. You should test that the gas is cut off within the prescribed period, which depends upon the appliance category, when the flame fails.