Isolation Point Locking
Isolation point locking is the practice of securing an energy-isolating device at the isolation point with a lock to prevent hazardous energy restoration until the lock is removed under an established procedure. It is part of lockout/de-energization, where energy-isolating devices must be secured in the safe position using locks, and isolation points must be identified, verified, and controlled before work begins.
In shop-floor applications, isolation point locking involves workers applying personal locks or approved group-locking arrangements to specific devices like disconnect switches, valves, or breakers that break or block energy paths. WorkSafeBC allows alternative securing methods such as cables, bars, or chains through lock points if criteria are met. For confined spaces, employers must keep records identifying every isolation point and visually verify effective isolation before entry. For electrical work, lockable isolating devices must be locked in the required condition to protect workers before work starts.
- Failing to identify and record all isolation points: WorkSafeBC requires a record identifying the location of every isolation point in confined space work, and missing one point can leave a hidden energy source active.
- Locking the wrong device or not verifying isolation: A device may look 'off' while another feed remains live; WorkSafeBC requires visual verification or other verification that isolation is effective, not just a tag or assumed shutdown.
- Using noncompliant or unsecured locking methods: A lockout arrangement must actually prevent removal or re-energization; WorkSafeBC requires locks on energy-isolating devices in accordance with procedure, and for some multi-device situations the securing method must meet specific criteria.
Is 'isolation point locking' the same as lockout?
It is the locking of the actual isolation point, and in practice it is the core mechanism that makes lockout effective.
Does a tag alone satisfy the requirement?
Not for hazardous energy control where lockout is required; WorkSafeBC guidance centers on physically securing the isolating device with a lock, with tags used as part of the procedure where applicable.
What is the standard verification step before work?
The isolation must be verified—WorkSafeBC requires visual checking or other verification for confined spaces, and electrical rules require the isolated condition to be established and locked before work proceeds.