Suspend a Permit for De-isolation for Test (DFT)

Status: Live Live → Suspension in Progress → Suspended for Test

Suspend a live permit so that isolations can be temporarily removed for a test (de-isolation for test), keeping control of the permit and its isolation certificate.

When to use

Use this task when a live permit needs its isolations temporarily removed to perform a test, then restored. It applies to permits with a Full ICC.

Before you start — check before launching the task

The work has stopped and the site is left safe before de-isolation.
The attached ICC is in place and will move through its DFT states (managed in the ICC module).

Step-by-step

As Performing Authority, request the suspension on the live permit.
As Permit Control Authority, sign Suspend and select the reason De-isolation for Test. The permit moves to Suspended for Test — unlike a revalidation suspension, which ends in Suspended.
The de-isolation itself is carried out on the attached ICC (see the ICC module). The permit's status is tied to the ICC's DFT states (DFT in Place / Partial DFT in Place). (Exact coupling — TO BE CONFIRMED with the ICC swimlane.)

Expected result

The permit is Suspended for Test; the isolation can be removed for the test, then the permit is re-issued for test (Re-issue a Permit for Test).

Key Referentiel rules

Work and its permit are suspended before isolations are altered for a test. (CR-GR-HSE-402, Req 3.5.5)
The safe state is defined and maintained through the de-isolation/test; isolation devices are managed under the powered-system isolation rules. (CR-GR-HSE-428 / CR-GR-HSE-432)

Tips & pitfalls

Tip — DFT is not a normal suspension. Choosing "De-isolation for Test" changes the downstream flow and ties the permit to the ICC test states.

Pitfall — removing isolations before the permit is Suspended for Test. Follow the order: suspend first, then de-isolate.

Common mistakes

Mistake	Consequence
Selecting the wrong suspension reason	Wrong downstream flow; cannot re-issue for test
De-isolating without the permit in the right state	Loss of isolation control; serious safety risk