Communications Methods for Fire Alarm

Communications Methods for Fire Alarm

NFPA 72 currently recognized four methods of communication from the protected premises to the supervising station for fire alarm systems. This post is only available to...
“Other Articles” of NFPA 70

“Other Articles” of NFPA 70

Article 760.3 (Other Articles) identifies other sections of NFPA 70 that also apply to fire alarm systems. This post is only available to...
The Point 7 Rule for Heat Detectors

The Point 7 Rule for Heat Detectors

While the Point 7 Rule can be mathematically calculated for heat detectors and applied to rectangular area and corridor applications, thankfully, the math has already been done for us in NFPA 72. This post is only available to...
The Point 7 Rule

The Point 7 Rule

NFPA 72 requires that all points on the ceiling have a detector within a distance of 0.7 times the listed spacing of the detector. This post is only available to...
Beam and Joists

Beam and Joists

When a ceiling surface has solid projection more than 4 inches, the distance between the projections center to center determines whether the projection is a joist or beam. This post is only available to...
Code Question – Air-Sampling Network Smoke Detection

Code Question – Air-Sampling Network Smoke Detection

Code Question – “Does the Annex A recommendation for located a smoke detector not closer than 3 feet from a supply or return air opening also apply to air-sampling network smoke detection?” This post is only available to...