Side-by-side reference

Understand the difference.

Compare the meaning, drawing context and source references of two entries. A similar graphic or shared abbreviation does not establish equivalence.

First referenceCompare with

Symbols

Arc-flash fibre loop sensor

A fibre loop sensor is an unjacketed optical fibre routed through busbar chambers or along switchgear lines. Light from an arc anywhere along its length enters the fibre and reaches the arc-flash relay, so one loop can cover a large area that would need many point sensors.

Drawing use: SLD / Schematic
Application: Metering & protection
Reference family: Manufacturer

A distinction that matters

A fibre loop covers a long area without locating the arc precisely; a point sensor watches one compartment.

Full reference

Symbols

Arc-flash point light sensor

A point light sensor is mounted inside a switchgear compartment, such as a breaker or cable compartment, and detects the intense light of an internal arc. It is wired or fibre-connected to an arc-flash relay that usually also checks for overcurrent before tripping, so light alone from an external source does not cause a trip.

Drawing use: SLD / Schematic
Application: Metering & protection
Reference family: Manufacturer

A distinction that matters

A point sensor covers one compartment; a fibre loop sensor covers a long area such as a busbar run.

Full reference

Original educational previews. Follow the source references on each full entry for the appropriate standard or selected product.