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I would read up to X volts as meaning X volts is the maximum allowed. It does not seem ambiguous to me. In previous contributions, I have suggested that this level has origins in obscure telecommunications engineering standards, e.g the ring and tip voltages on old analogue exchanges.

Nice!

Butane is heavier than air so will flow downhill. But R134 is also very dangerous, if it is subject to heat as it decomposes into I believe phosgene gas. There are safety warnings about smoking cigarettes close to it, not the fire risk but the poison risk. But I take your point that even a...

I was like that once, when I was 2 or 3 but then I learned to read.

A well structured and considered posting, but it is not the butane or pentane in the compressor which is the significant risk but that inside the foam. I just checked the amount in my hotpoint fridge 2.5 grams and in my freezer 5 grams. There would be more in a butane lighter . There are...

I value my insecurities, they are what make me.. We are approaching engineering design from opposite view points. In my universe, the primary requirement is that the product or process functions, if it does not the company gets mired in extensive and expensive lawsuits. Next is will the client...

.the fuel in aeroplanes and cars . is a good analogy, there is always a risk and reward in play. One of the factors in the introduction of diesel fuel into domestic cars, was the perception that it was less likely to ignite in a fault situation. Again hazard management would be about...

... I am not bitter about Northerners, my grandfather came from Ballycastle. I am bitter about the needless anguish that both the IRA, and it's fellow travellers, and the UDA and it's fellow travellers subjected the rest of the people in NI to for a generation. I am bitter that the intrangence...

.. I was not referring to accidental causes.

.. On reflection I want to revise my previous comment , All those high rise buildings in the UK , particularly those whose names have been published are now intrinsically much less safe than they were a fortnight ago. Careless talk costs lives, and this is a case in point where vulnerabilities...

.. flecc for someone so knowledgeable, that's a rare lapse. Since the glass fibre is already oxidised silicon, where is the exothermic energy to come from. The vapourisaton phase will absorb energy.

.. Cost is not the only criterion in an R&D department. , Otherwise we would all be flying in paper aeroplanes. Modern engineering practice has a multiple matrix of interlocking criteria, and good design is an acceptable mix of the criteria, bad design is where one of the criteria is ignored and...

Tommie, Tommie, don't you read the newspapers, look up the proceedings of laganside court of last week where a uda operative or self styled commander was sentenced to multiple life sentences . Or remember your history where ex President McAleese , was burnt out of her home on the ardoyne as a...

.. not everything can burn.. not everything can burn under normal or even extraordinary conditions. Glass fibre will not combust, it may melt together but support combustion no.

.. Look I accept the principle of risk management and your earlier post about Swiss cheese has validity, to a limited extent. Accidents are usually multi factorial, .. if would not have fallen except I was going that way and there was a banana skin and I was looking at the horizon. Of those...

Sorry tilson that won't wash.Your first paragraph is fine. It is not feasible to protect against all contingencies. All engineering is compromise . A concrete aeroplane won't burn , but neither will it fly. But then your posting goes down hill. As you must be aware, there are classes of...

Neither the airbrick or the catflap will be smoke tight, the metal letter flap will be. The aperture for the letter flap should be much smaller than a catflap.

.. my understanding is that deep discharges do reduce lifetime as does the total number of full charge cycles. The physical structure within the cell changes, volume increases as the chemical structure changes. The crystal structure is rigid and stresses cause mechanical strain and microbreaks...

.. sorry kind souls are in short supply , this forum's quota has been assigned to the brexit thread.

.. the technology has been available to do that for a long time, but it still comes back to whether the compromise of having a battery embedded in the bike suits. .. see previous posts on charging. Battery packs mounted inside below the rear carrier are very unobtrusive., especially with...