Isolation Point Testing
How does WorkSafeBC explicitly treat isolation point verification for confined spaces?
WorkSafeBC Part 9 requires employers to keep a record identifying the location of every isolation point and to visually check or otherwise verify each isolation point to ensure the confined space is effectively isolated before a worker enters. The permit must list all isolation points, and a designated person must physically confirm and document device positions and lock/tag status.
What are the technical requirements for electrical isolation point testing under WorkSafeBC?
Under Part 19, equipment is considered isolated only after normal energy sources are disconnected. Isolating devices must provide visual verification of the opening. After a safety protection guarantee, equipment must be tested to verify isolation before grounding and blocking. Approved test instruments must be used for absence-of-voltage testing, following the test-the-tester, test-the-circuit, test-the-tester-again routine.
How should isolation point testing be integrated into a SafeDesk Permit to Work workflow?
In SafeDesk, pre-permit planning compiles a list of isolation points from engineering docs. The permit includes an Isolation Certificate listing each point, required locks/tags, and verification tests. Technicians apply locks and perform tests, recording results in SafeDesk. Supervisors review the verification record before approving the permit. During work, SafeDesk prompts re-checks for high-risk jobs. Close-out involves controlled removal of isolations with separate verification.
Isolation Point Testing is the formal, documented verification that each identified isolation point effectively separates equipment or a confined space from all hazardous energy or materials before work begins, and that this isolation remains secure throughout the job. It includes visual checks of device position, functional tests to confirm zero-energy or no-flow conditions, and technical tests such as absence-of-voltage testing for electrical systems.
On a manufacturing shop floor, Isolation Point Testing is integrated into Lockout/Tagout (LOTO) and Control of Hazardous Energy (CoHE) procedures. The workflow begins with identifying all isolation points using P&IDs and electrical diagrams, then applying locks and tags. Pre-work verification includes visual checks of device positions, functional start tests to confirm equipment does not operate, and technical tests like test-before-touch for electrical circuits or depressurization checks for piping. Results are documented on isolation certificates linked to permits. During work, isolation points are monitored for tampering or re-accumulation of stored energy, with re-checks scheduled per risk assessment. Post-work, isolations are removed under controlled verification.
Incomplete or incorrect isolation record: Failure to identify all isolation points, such as secondary feeds or bypass lines, leading to residual energy or materials reaching the work area.
Assumed isolation without adequate testing: Relying only on switch or valve position without physical testing, such as skipping test-before-touch for electrical systems or failing to verify depressurization.
No monitoring for re-accumulation of energy: Assuming isolation remains perfect throughout the job without scheduled re-checks, ignoring risks like hydraulic creep, thermal expansion, or back-feeding.