On Thu, 17 Aug 2017 10:40:35 +0100 (BST)
"Dave Liquorice"  wrote:

> On Wed, 16 Aug 2017 08:08:17 +0100, Folderol wrote:
>
> > The fire alarms and emergency lighting are all SLA powered. The
> > batteries are still good after about 10 years ...
>
> Not APC kit then, thier stuff cooks batteries in around 3 to 4 years.

That wouldn't be the 'bulging battery' syndrome would it?
One of my colleagues came across that some years ago. Crappy over-complicated
charge circuit built on cheap PCB (not fibreglass). Current driven series
transistor with no heatsink charred the pcb so there was enough C-B leakage to
prevent the transistor switching off properly.

> > ... -  every month they are tested, and the lighting run for 30 minutes.
>
> Hum isn't it a legal requirement for emergency lighting to run for >3
> hours? A 30 min run won't show up a battery that has lost capacity
> below that required for a >3 hour run time.

Single story office complex with separate single story workshop, both with
plenty of access. We were told 1 hour, and since we can easily evacuate both
buildings in less that 10 minutes, I don't think we'll have a problem with a 30
min test :)


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W J G

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