AS 1670.3:2018 pdf free

AS 1670.3:2018 pdf free.Fire detection, warning, control and intercom systems – System design,installation and commissioning
The capacity of the standby power source shall be such that in the event of the absence of the main power source the standby power source shall be capable of maintaining the ASE in normal working (quiescent) condition for at least 24 h, after which sufficient capacity shall remain to operate the alarm load for 30 minutes.
The battery capacity shall be calculated in accordance with Clause 3.4.6.
When calculating battery capacity, allowance shall be made for the expected loss of capacity over the useful life of the battery. A new battery shall be at least 125 percent of the calculated capacity requirements, based on a loss of 20 percent of its capacity over the useful life of the battery.
The battery capacity requirement shall be determined as follows:
(a) Determine the quiescent load current (IQ).
(b) Determine the alarm load current (IA).
(c) Determine the capacity de-rating factor (Fc) of the battery when discharged at the full load rate taking into account the minimum operating voltage of the connected ASE using the battery manufacturer’s data. Where more than one ASE is connected to the battery, use the highest minimum operating voltage of any of the ASEs. A value of two for FC is deemed to satisfy these requirements.
Externally energized circuits at voltages in excess of ELV, except the AC mains for ASE,shall not enter the ASE cabinet.
Where the various component parts of the ASE are installed in separate locations, they shall be connected so that the wiring is supervised.
NOTE: In areas prone to severe lightning activity, ASE may require additional surge protection to wiring external to the building. This may include lightning suppression systems associated with the general building wiring.
Specialist cables including multi core, that are not available with the marking in this Clause shall have permanent red markers of at least 25 mm in width spaced at intervals of not more than 2 m along the cable length when not installed in conduit.AS 1670.3 pdf free download.