Why it matters
Falls are one of the main causes of death at work in Singapore. A worker does not need to be high up. A slip off a 2-metre platform onto concrete can be fatal.
Most falls happen during short jobs. Someone changes a light, fixes a pipe or steps past a removed barrier for a minute. The plan for the big job does not cover the quick one, so nobody checks.
Your job as supervisor is to spot the edge before the worker reaches it. You set up the protection. You stop the work when it is missing.
What counts as work at height
Under the Work at Heights Regulations, work at height is any work where a person could fall from one level to another and get hurt. That covers elevated platforms, edges, openings and fragile surfaces. It also covers falls into a pit or trench below ground.
The law calls it hazardous work at height when the possible fall is more than 3 metres. That is the point where the permit-to-work rules start for factories.
- Roofs, mezzanines, floor edges and lift shafts
- Scaffolds, mobile elevated work platforms (MEWPs) and ladders
- Openings in floors, and gaps left when covers are lifted
- Fragile roofing sheets and skylights
- Pits, sumps and deep trenches a person could fall into
Order of controls
Work down this list. Only move to the next step when the one above is not reasonably practicable. You can combine steps, and you usually should.
Harnesses come last for a reason. A harness does nothing to stop the fall. It only limits the injury once the worker is already falling, and only when it is rigged right.
- Eliminate. Do the work from the ground. Use extension poles, lower the fitting, or prefabricate at ground level and lift into place.
- Substitute. Swap a ladder for a MEWP or a tower scaffold with guard-rails.
- Engineer. Fit guard-rails, toe-boards, secured covers and barriers. These protect everyone without any action from the worker.
- Administer. Permit-to-work, safe work procedures, briefings, exclusion zones and supervision.
- Personal protection. Travel restraint keeps the worker away from the edge. A fall arrest system catches the worker after a fall. Prefer restraint.
Edges, openings and fragile surfaces
Guard every open side and opening where someone could fall more than 2 metres. The top rail must be at least 1 metre above the platform. The gap between rails, or between the platform and the lowest rail, must not exceed 600 mm.
Covers must be strong enough for the load and fixed so they cannot slide off. Mark them so nobody lifts one by mistake.
You may remove a cover or rail for work at that spot. Put it back the moment the work or material movement stops. While it is off, the worker uses travel restraint. If restraint will not work, they use fall arrest.
Keep people off fragile surfaces where you can. If they must cross, give them crawler boards or platforms that carry the load. Post warning signs at the approach.
Harnesses, anchors and rescue
A fall arrest system with a full-body harness needs an energy absorber. It also needs enough clearance below so the worker stops before hitting the ground or a structure. Work out the clearance before the job. Lanyard length, absorber stretch and the worker's height all add up.
A competent person must check every anchorage and anchorage line at the start of each shift. Defective ones come out of service at once. The results go into a register.
After any fall, take the whole harness set out of service. A competent person or the maker must clear it before reuse.
Plan the rescue before work starts. A worker hanging in a harness can suffer serious harm within minutes. Know who goes, with what equipment, and how fast.
Scaffold guard-rails and pipework are not designed to hold a fall. Use a rated anchor point or a lifeline installed for the purpose.
What the rules require (Singapore)
The main law is the Workplace Safety and Health (Work at Heights) Regulations 2013. The Code of Practice for Working Safely at Heights explains how to comply.
- Avoid it (reg 4). No work at height where it can reasonably be done safely another way.
- Fall prevention plan (reg 5). Required at worksites, shipyards, factories with 50 or more workers and certain process plants listed in the First Schedule. Keep it ready for an inspector.
- Training and supervision (regs 6 and 7). Workers need training before they work at height. A competent person must supervise them directly.
- Open sides (regs 8 and 9). Guard falls of more than 2 metres. Top rail at least 1 metre high, gaps no more than 600 mm.
- Anchor checks (reg 12). A competent person inspects anchorages and lines at the start of every shift. Keep the register for at least 2 years.
- Roofs (reg 16). Where a fall of more than 2 metres is possible, provide protection against sliding and secure anchorage.
- Permit-to-work (Part III). In a factory, hazardous work at height needs a permit issued by the authorised manager. A safety assessor checks the site first. The supervisor posts the permit at the work area.
Breaking most of these rules can bring a fine of up to $50,000, up to 2 years in jail, or both (reg 31).
The permit-to-work, step by step
The supervisor applies and states the safety measures. The work-at-height safety assessor inspects the site with the supervisor and endorses the application. The authorised manager issues the permit only when no clashing work is planned nearby and the crew has been briefed.
The code of practice allows a permit to run for up to seven days if conditions stay the same. The authorised manager still reviews it every day. Post a copy at the work area. When the job ends, the supervisor checks that everyone is out and the area is safe, then tells the authorised manager.
Common mistakes
These come up again and again in incident reports. Look for them on every walk round.
- A floor cover lifted for one task and never put back.
- A harness worn but not clipped on, or clipped to something that cannot hold a fall.
- A short lanyard on a low platform, with too little clearance to stop the fall in time.
- No rescue plan, so a suspended worker waits for the fire service.
- A permit signed in the office without anyone looking at the site.
- Stepping onto a skylight or fibre-cement sheet to save a few steps.
Five-minute jobs kill people. If someone will go near an edge, the controls apply, however short the task.
In other countries
- Indonesia: Permenaker No. 9 of 2016 sets the rules for work at height. Employers must plan the work, assess the risk and supervise it. Workers at height must hold a competence certificate and a K3 licence from the Directorate General. The licence lasts 5 years. Source: Permenaker 9/2016 (BPK database).
Use it on site: the working at height checklist and the toolbox talk to brief your crew.
Sources
- Workplace Safety and Health (Work at Heights) Regulations 2013, Singapore Statutes Online (AGC).
- Code of Practice for Working Safely at Heights, WSH Council.
- Preventing Falls from Heights, WSH Council.
- Permenaker No. 9 Tahun 2016 tentang K3 dalam Pekerjaan pada Ketinggian, Kemnaker (via BPK JDIH).
This is practical guidance, not legal advice. Laws and codes of practice change; always check the current official text and your site's own procedures.
