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| Fig: Smoke Detector Wiring Diagram |
The Guideline for Smoke Detector Installation Wiring as per Manufacturer Instruction and NFPA 70 Article 760
In the Fire Alarm System, smoke Detector installation wiring should as per
international standard like NFPA 70 article 760
and NEC- National Electrical Code and of
course followed by manufacturer instruction manual wiring diagram.
You must be considering that
smoke detector installation wiring for fire alarm system is very different from
typical House Wiring or Electrical Wiring system. The main purpose of
fire alarm system wiring is to be able each sensing detector like smoke
detector to continuous electrically supervision.
To make sure the fire alarm
system completely operating without any trouble, the very first and basic rule
is to follow the manufacturer’s instruction on smoke detector installation
wiring diagram.
Smoke Detector Installation Wiring Techniques
The rules of electrical
supervision of smoke detectors are not very complex. However, the technician
should be familiar and well experienced in the fire alarm system installation
works.
The best and easy technique
for smoke detector installation is follow the manufacturer’s wiring
installation guide. Manufacturer’s wiring guide shows connections in a certain
manner to provide accommodation of supervision requirements.
Over-emphasizing the
manufacturer’s wiring guide, portion of the circuit may not work for proper
supervision, while a short or open circuit occurs.
Smoke Detector Installation Wiring Guidelines
In the incorrect portion of
the above figure wiring diagram are shown a very simple mistake known as
T-tapping wiring.
In first portion of figure indicated incorrect wiring, smoke detector-1 is wired as T-tapping. This T-tapping is very correct wiring technique in typical electrical wiring system, but not in smoke detector installation wiring.
This smoke detector may operate correctly in alarm conditions, but if disconnected from the wiring no trouble would be detect in fire alarm system.
In first portion of figure indicated incorrect wiring, smoke detector-1 is wired as T-tapping. This T-tapping is very correct wiring technique in typical electrical wiring system, but not in smoke detector installation wiring.
This smoke detector may operate correctly in alarm conditions, but if disconnected from the wiring no trouble would be detect in fire alarm system.
In the correct portion of the
above figure shown correct installation wiring method for smoke detector-1
where fire alarm panel will indicate trouble if any loss of supervision occurs
in any point of the circuit.
Also some smart fire alarm systems are available in the markets
that allow T-tapping smoke detector installation wiring. Finally, before the
system put into operation, should check the short circuit, open circuit,
grounding and each detector as per manufacturer’s instructions.
The article was up to the point and described the information very effectively. Thanks to blog author for wonderful and informative post.
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