Class A wiring
Ring wiring returned to the panel so devices stay in communication from the other direction after a single break.
Fire Engineering Glossary
Technical terms spanning standards, manufacturers, commissioning, networking, testing and fault finding.
Technical guidance only. Confirm current project requirements against the applicable standards, legislation, system documentation and site-specific fire strategy.
Showing 5 of 5 matching glossary entries.
Class B wiring
Radial (spur) wiring; devices beyond a break are lost, so a break shows as multiple missing devices downstream of one point.
EN 54-23
The EN 54 part covering visual alarm devices (VADs), including the coverage classification system used to select and site them.
End-of-line device
The resistor, capacitor or active unit at the end of a monitored circuit that lets the panel supervise the wiring for open and short circuit faults.
Visual alarm device (VAD)
A flashing warning device providing visual alarm indication, selected and sited using its rated coverage classification.