VI on visual signalling devices
-
ali_baby
- Posts: 3
- Joined: Tue Oct 12, 2010 9:00
VI on visual signalling devices
I've jut finished a partial VI on a signal isolator as well as a strobe in a deellin unit of a hi rise building (tenant is deaf-hence need for visual). Th electrician that installed the devices insists that the visual is off on silence, I insist off on reset. Who's right and where can I find the reference for that?
-
FIRETEK
- Site Admin
- Posts: 71
- Joined: Sat Aug 23, 2008 9:10
- Location: Vancouver, B. C., Canada
- Contact:
Re: VI on visual signalling devices
Welcome to the forum!
There is no actual requirement in either the Codes or Standards that specify that strobes (visual appliances) must be wired on a separate circuit from insuite buzzers (which would result in the operation of the appliances in the manner in which you describe). The only limitation I can reference is the output current for the isolator module or the common signal silence button (neither of which take into consideration the higher current draw of a strobe). If a design engineer was involved (in either a prior addition or the base fire alarm system), he may have referenced a requirement for independent circuits in which case the contractor would have to abide by the pre-existing sequence of operation in any new addition in order to avoid confusing anyone.
Reference is made to silencing AUDIBLE signals throughout the standards (both CAN/ULC-S524-01 and CAN/ULC-S537-04). An interpretation by the Authority Having Jurisidiction would be the suggested course of action in your case.
There is no actual requirement in either the Codes or Standards that specify that strobes (visual appliances) must be wired on a separate circuit from insuite buzzers (which would result in the operation of the appliances in the manner in which you describe). The only limitation I can reference is the output current for the isolator module or the common signal silence button (neither of which take into consideration the higher current draw of a strobe). If a design engineer was involved (in either a prior addition or the base fire alarm system), he may have referenced a requirement for independent circuits in which case the contractor would have to abide by the pre-existing sequence of operation in any new addition in order to avoid confusing anyone.
Reference is made to silencing AUDIBLE signals throughout the standards (both CAN/ULC-S524-01 and CAN/ULC-S537-04). An interpretation by the Authority Having Jurisidiction would be the suggested course of action in your case.