Planning an electrical shutdown in an occupied building

CCT 01Define the outage boundary and the reason for the work

Use reviewed distribution information to establish what loses power. Include shared services and equipment outside the obvious work area. Ask the electrical contractor to identify uncertainty before tenant notices are issued. An inaccurate directory can turn a limited shutdown into an unplanned interruption elsewhere.

State the reason for the outage and the acceptance criteria. Replacing a component, testing distribution equipment and modifying a service are different work packages. Optional improvements should have a separate decision about cost, time and risk.

This is an owner coordination checklist. Alberta's OHS framework governs workplace safety, and the qualified team must establish the job's hazard controls and procedures.¹ Building staff should not use this guide to operate electrical equipment or improvise an isolation plan.

CCT 02Ask every system owner what loss of power changes

Have the operator review IT, access control, security, elevators, ventilation, pumps, refrigeration, tenant processes and relevant life-safety systems with their responsible specialists. Ask what must happen before power is removed, what happens during the outage and who must attend the restart.

Do not assume a standby source covers every system, or that a device will automatically return to its intended state. The relevant specialists should confirm those assumptions for the actual building.

CCT 03Separate utility work from building work

Where the plan involves the utility supply, confirm ENMAX's role, application process and booking requirements using its maintenance-outage information.² The electrical contractor's availability and the utility's confirmed appointment are separate dependencies.

Record the scope boundary, utility reference and readiness requirements in the project file. If inspection or other acceptance is needed before restoration, identify who arranges it and how the result reaches the party responsible for energization.

The owner should receive a schedule showing preparation, interruption, work, testing, restoration and operator acceptance. A quotation stating an expected repair duration does not cover all of these stages.

CCT 04Hold a readiness check before the outage becomes costly to cancel

Confirm delivered equipment, reviewed work scope, required approvals, specialist attendance, access and tenant notices. Give each unresolved item a decision-maker. Establish the latest point at which the team will postpone rather than begin an outage with a missing dependency.

Discuss foreseeable problems and the agreed escalation process. The technical team should determine appropriate contingencies; the owner should understand the operating consequences and who may authorize a changed plan. Do not promise a restoration time without those assumptions being stated.

Communicate a realistic window and contact route to affected occupants. Keep updates consistent through one coordinator so tenants are not trying to reconcile conflicting messages from multiple trades.

CCT 05Restore operations with a named acceptance process

Power restoration starts the hand-back process; it does not finish every system's restart. Have the responsible operators and specialists complete the agreed checks and report exceptions. Record alarms, faults and deferred items with an owner and next action.

Collect the contractor's work and test records, inspection information and updated drawings. Compare actual results with the original scope, including any changed settings or equipment. The handover guide provides a document checklist.

Finish with a short review: what changed, which records were unreliable and what should be prepared differently next time. This is especially useful for property teams managing several buildings, where the next shutdown may involve different staff.