# Lockout

Canonical URL: https://eloragrid.ai/protection-functions/86-lockout
Publisher: Elora Grid
Updated: 2026-10-13
Lookup label: 86
Drawing use: SLD, Schematic
Reference families: IEEE / ANSI

A lockout function or device with the documented reset and blocking behaviour.

## What it represents

A lockout function or device latches an operating condition and participates in the specified trip or blocking arrangement. Its reset and implementation depend on the selected scheme. It can be realised in physical equipment or through documented control logic.
On a power drawing, keep this function reference connected to the selected equipment and its complete designation. A multifunction relay can implement several numbered functions. This entry explains the reference; it supplies no settings or commissioning procedure.

## How to read it

- Identify the initiating conditions and the affected devices.
- Read reset and blocking behaviour from the actual scheme documentation.

## Information to show or reference

- Reference initiating functions.
- Identify blocked or tripped devices.
- Document the selected reset arrangement.

## Important distinction

A lockout reference is not a mechanical isolation procedure and does not itself establish an authorised operating instruction.

## Facts

- ANSI / IEEE function number: 86
- Equipment implementation: Consult the selected device manual
- Suffix interpretation: Application and manufacturer documentation

## Public references

- [Public reference table of ANSI device-function numbers](https://www.se.com/es/es/faqs/FA34639/) — Schneider Electric. Public manufacturer table used to check the base function-number name.
- [IEEE C37.2-2022: power-system device function numbers](https://ieeexplore.ieee.org/document/9984140) — IEEE. Normative publication reference for the device-function convention.

## Graphic scope

Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.