Ceiling Void Refurbishment in a 1978 Retail Unit
A contractor is asked to replace the fluorescent fittings in the ground-floor retail area of a 1978 building in Nicosia. The ceiling void is formed by fibre-cement boards fixed to a steel grid, and the only access is through a 600 × 600 mm hatch. The client wants the work done over a weekend while the shop is closed. The existing wiring runs in the same riser as a 400 V busbar chamber whose cover is missing and whose links are exposed; the riser door has no lock. Two electricians will work from a mobile tower in the sales area, and the shop's intruder alarm and fire detection must stay live. The project manager says the ceiling boards are 'just cement' and asks the team to cut an access hole for the new cable route. No asbestos survey has been provided, and the building logbook cannot be found.
1. What should happen before any ceiling board is cut, and what is your immediate action when the project manager tells you the boards are 'just cement'?
Read the worked answer
Do not cut. A 1978 fibre-cement ceiling board is a classic asbestos-containing material location, and the absence of a survey or register means the material must be presumed to contain asbestos, not assumed safe. The project manager's verbal assurance has no legal weight; the duty holder must provide the asbestos survey/register before any intrusive work.
Actions:
- Stop the task and prevent anyone entering the ceiling void; barrier off the hatch.
- Inform the client and project manager in writing that work is suspended pending a refurbishment/demolition asbestos survey by a competent person.
- If a survey cannot be produced, arrange sampling by an accredited laboratory. If asbestos is confirmed, use a licensed removal contractor, enclosure, RPE/PPE, decontamination and clearance before cables are run.
- Look for a route that avoids disturbing the boards - existing voids, surface trunking, or a penetration through a non-asbestos wall.
- Record the decision and the delay. A weekend programme is commercial pressure, not a safety control.
2. Set out the isolation and permit arrangements for the riser and the lighting circuits, including the circuits that must remain live.
Read the worked answer
The riser contains a live 400 V busbar and exposed links, so it must be treated as a separate source from the lighting circuits.
- Identify every source: the busbar upstream of the main switch, any UPS/generator, and the fire and intruder alarm supplies.
- Agree a shutdown with the person in control of the building and, if the busbar cannot be isolated locally, with the DNO. A missing cover and exposed links are not acceptable while work is going on nearby; the riser door must be locked or the busbar shrouded.
- Isolate, lock off with a personal lock and warning notice at the point of isolation, and prove dead with an approved voltage indicator on all line and neutral conductors. Prove the indicator on a proving unit before and after testing.
- For the fire and intruder systems that must stay live, use a separate dedicated supply, label it clearly, and record it. Never rely on a label alone - confirm the supply is not from the isolated section.
- Use a permit to work naming the isolation points, the person authorised to isolate and the person authorised to work.
- If the busbar cannot be made safe, do not work in the riser; re-route the cable or return when a shutdown has been arranged.
3. The mobile tower must be moved across the sales floor each hour. Identify the health and safety controls you would insist on and the circumstances in which you would stop the job.
Read the worked answer
Tower controls: PASMA-trained erectors, pre-use inspection, firm level floor, outriggers/stabilisers, guardrails, toe boards, safe ladder access, brakes on, never move with people or materials on the platform, exclusion zone below, tools tethered, emergency rescue plan and a means of calling help. Consider eliminating the tower first - a scissor lift or long-reach tools from floor level may be safer.
Stop work if:
- the asbestos survey is still missing;
- the busbar remains exposed or the riser cannot be secured;
- the tower cannot be stabilised or the floor cannot take the load;
- the fire alarm has to be isolated without an agreed procedure;
- the client refuses to accept the permit conditions;
- the escape route or fire exit is blocked.
Record the stop and the reason, and escalate to the client's responsible person. Explain that 'the shop is closed' does not remove the need for a safe system of work.