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Fire Alarm Communications Technologies

Fire Alarm Communications Technologies

NFPA 72 recognizes four communications technologies: performance based, digital alarm communicator, one-way radio, and two-way radio systems. Each of these technologies has specific performance requirements and encompasses different types of equipment.   Performance...

NFPA 72 circuits and pathways

NFPA 72 circuits and pathways

NFPA 72, National Fire Alarm and Signaling Code, defines the performance of fire alarm circuit and pathways in Chapter 12. While the terms “circuit” and “pathway” are often used interchangeably, they are different. A circuit is defined in Chapter 3 as “either means of...

Q&A: Maximum Standby Battery Capacity

Q&A: Maximum Standby Battery Capacity

Question: A fire alarm project specification requires a maximum 72 hours standby capacity for the system. NFPA 72 requires a minimum standby capacity of 24 hours. What is the maximum standby capacity permitted by NFPA 72?   Answer: Chapter 1 of NFPA 72 identifies...

Q&A: Annex A of NFPA 72

Q&A: Annex A of NFPA 72

Question “Is Annex A of NFPA 72 explanatory information or optional requirements?”   Annex A of NFPA 72 is one of several “usability annexes” in NFPA 72 designed to enhance our understanding and application of NFPA 72. Annex A is arguably the most important annex...

The Fresnel Zone

The Fresnel Zone

When setting up a wireless link, the first rule is to achieve line of sight between the transmitter and receiver. Line of sight means that you can physically see the other device from either location fully and clearly without any obstructions. While some wireless...

Fee for Declined Credit Cards

Fee for Declined Credit Cards

We're pleased to be partnering with Ken Kirschenbaum to bring you some of the questions he has been asked regarding legalities with licensing and contracts. You can sign up to receive emails from him with all of the questions posed and his replies by visiting his...

Access Control – Egress Requirements

Access Control – Egress Requirements

Electronic access control does just that -- controls access to a building or area using an electric lock and by requiring individuals to present a valid credential to a reader to gain entry. Controlling entry (access) is the function of an access control system, and...

Corridor Spacing of Strobes in High-Rack Storage

Corridor Spacing of Strobes in High-Rack Storage

Question: Visible notification (strobes) are being provided in a warehouse application with high-rack storage. The racks isles are less than 20’ feet wide, 100 feet long, and the ceilings are 40’ high. Can the corridor spacing rules of NFPA 72, Chapter 18 be used for...

Video Security Systems – Megapixel and HD

Video Security Systems – Megapixel and HD

The video security industry has come a long way in recent years. We have graduated from tube cameras and VCRs to network cameras and digital recorders. This technology upgrade has given us higher performance capabilities and improved image quality.   One of the...

Service Plan Wear & Tear

Service Plan Wear & Tear

We're pleased to be partnering with Ken Kirschenbaum to bring you some of the questions he has been asked regarding legalities with licensing and contracts. You can sign up to receive emails from him with all of the questions posed and his replies by visiting his...