In adding a fire alarm to an existing power source, when is a T-branch/splice acceptable?

In adding a fire alarm to an existing power source, when is a T-branch/splice acceptable?

• A. Always acceptable
• B. Sometimes with proper approval
• C. Only by licensed electrician
• D. Never acceptable

Answer: (D)

The essential idea is that fire alarm power must be supplied in a controlled, supervised, and listed manner to ensure reliability in a life-safety system. A T-branch or splice off an existing power source introduces an unapproved connection point that isn’t part of the labeled, tested wiring path for the alarm. This can lead to voltage issues, backfeeding, overloads, or supervision problems, all of which threaten the system’s ability to operate when needed. Because of these reliability and code concerns, feeding the alarm from another circuit via a simple splice is not allowed. The correct approach is to use a dedicated circuit or a listed power supply designed for fire alarm systems, installed and wired following the manufacturer’s instructions and applicable codes. This work should be done by a qualified electrician, using listed components and proper enclosures to maintain proper supervision and reliability.

The essential idea is that fire alarm power must be supplied in a controlled, supervised, and listed manner to ensure reliability in a life-safety system. A T-branch or splice off an existing power source introduces an unapproved connection point that isn’t part of the labeled, tested wiring path for the alarm. This can lead to voltage issues, backfeeding, overloads, or supervision problems, all of which threaten the system’s ability to operate when needed. Because of these reliability and code concerns, feeding the alarm from another circuit via a simple splice is not allowed. The correct approach is to use a dedicated circuit or a listed power supply designed for fire alarm systems, installed and wired following the manufacturer’s instructions and applicable codes. This work should be done by a qualified electrician, using listed components and proper enclosures to maintain proper supervision and reliability.