Re: Ademco 50P - Unable To Disarm

["Crash Gordon" <webmaster@xxxxxxxxxxxxxxxxxxxxx>]

 I have my own spreadsheet calculator with all the models of equipment I use
already in it...just a matter of ticking off boxes. But, since I don't do
commercial fire anymore I only use it for really big resi jobs. If you've
been doing this junk for a few thousand years, you kinda just "know" when
you're getting close to the limit for the brands of equipment you use...time
to pull out hte spreadsheet:-)


"Robert L Bass" <robertlbass@xxxxxxxxxxx> wrote in message
news:D4mdnRaiRYAxseDZnZ2dnUVZ_tednZ2d@xxxxxxxxxxxxxx
|> Actually I think it's more practical to do the calcs
| > on paper with in-alarm ma ratings of all devices.
|
| I always did my battery calcs as follows:
|
| 1.  Add up mA ratings of all devices that will be operational during an
| alarm condition.  Deduct the drain for 1/4 hour of alarm sounding from the
| available Amp-Hours.
|
| 2.  Add up mA ratings of only those devices which run when the system is
not
| in an alarm state.  Divide into the remaining AmpHours.
|
| By calculating the current drawn in an alarm state first you allow the
| system to run 24 hours (72 hours for some facilities) and still have
enough
| juice to sound the alarm for fifteen minutes.
|
| I don't recall if that's actually required but it's the way I learned to
do
| it.  I never had a submittal turned down for battery calcs so I guess the
| inspectors like it that way.  I've tried a few Excel battery calc
| spreadsheets over the years and though they're quicker than using a hand
| calculator they tend to be cumbersome and none of them cover all of the
| different types of hardware you might use on any given job.
|
| --
|
| Regards,
| Robert L Bass
|
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