Module 1 explained how enclosure and a foreseeable specified risk make an area a confined space. It also introduced six ways a serious incident can arise. This module turns that knowledge into practical duties: who plans the work, who controls entry, and what protection must be ready before a worker goes inside in Great Britain.

The wider workplace duties come from the following legislation:

• The Health and Safety at Work etc. Act 1974
• The Management of Health and Safety at Work Regulations 1999

These requirements cover work throughout Great Britain; Northern Ireland has equivalent law, including the Confined Spaces Regulations (Northern Ireland) 1999, enforced by HSENI. They assign responsibilities to employers, workers, and people who manage or control the site, including the duty to assess hazards and coordinate protective measures.

We then look at the Confined Spaces Regulations 1997, which addresses work in confined spaces directly, and consider how its entry rules fit with the broader health and safety duties.

The Health and Safety Executive’s Approved Code of Practice, L101 Safe work in confined spaces, explains workable precautions in greater detail. It has a special legal status: following it is normally enough to comply with the duties it covers, and a court may examine it when deciding whether the measures used were adequate.

This module covers the following connected decisions:

• Which laws and guidance apply to an entry task
• The core workplace health and safety duties under the Health and Safety at Work etc. Act 1974
• The requirements for assessing and managing risks under the Management of Health and Safety at Work Regulations 1999
• The specific entry duties in the Confined Spaces Regulations 1997
• How competence, training, and fitness affect the team chosen
• Where a permit to work helps control a particularly hazardous job
• Activities dealt with under other specialist rules
• Additional risks beyond the six specified risks
• What each worker must do to support the safe system

A confined-space project sits within several layers of workplace law. The main provisions to check are:

• The Health and Safety at Work etc. Act 1974
• The Management of Health and Safety at Work Regulations 1999
• The Confined Spaces Regulations 1997

Together these duties require a planned approach to risks, suitable controls, competent people, supervision, and emergency preparation. The precise precautions depend on both the space and the work carried out there.

Other rules can become relevant because of the particular site, activity, or substance. Examples include requirements addressing:

• Construction work and the management of construction projects
• Exposure to chemical agents or substances hazardous to health
• Occupational noise and the prevention of hearing damage
• Hand-arm and whole-body vibration from tools and equipment
• Selection, provision, and correct use of personal protective equipment
• Exposure to asbestos and the controls required for asbestos work
• Exposure to lead and the management of lead-related hazards

The assessment must look at the actual work. Identify which of these topics applies, then bring its relevant controls into the planned safe system rather than treating the confined-space rules in isolation.

The Health and Safety at Work etc. Act 1974 provides the broad foundation for protecting people at work in Great Britain.

Employers must take reasonably practicable steps to safeguard the health and safety of workers. For confined-space tasks this means considering how entry can be avoided, preventing foreseeable harm, selecting controls, and ensuring the plan works in practice.

Reasonably practicable decisions weigh the level of risk against the effort, time, and cost of controlling it. A serious foreseeable danger cannot be dismissed because a precaution is inconvenient or costs money.

The protection also extends to contractors, visitors, and members of the public who could be affected by the work, including people near an entry point or connected plant.

Responsibility can also attach to the person or organisation that controls a workplace, a building, or an area within it. Control may be shared, so everyone involved must understand the boundaries of their duties.

This may include:

• An employer occupying or operating the premises
• A property owner or landlord controlling part of the building
• A facilities team responsible for access, routes, and installed safety systems

For a confined-space task, the site controller should help ensure:

• The intended access and exit routes are suitable for the job and a potential rescue
• Known hazards, including services connected to the space, are passed to the entry team
• Barriers, signs, communications, and other site controls are coordinated

Failures to manage these matters may breach workplace safety duties. Where several employers share a site, they need to cooperate so no vital precaution falls between them.

The Management of Health and Safety at Work Regulations 1999 supports systematic management of workplace risks, including the hazards that arise during entry, maintenance, cleaning, and inspection of enclosed places.

Core employer actions include:

• Assess foreseeable risks and retain a suitable record of important findings
• Review the assessment whenever the work, equipment, or conditions change
• Arrange health surveillance when an identified exposure makes it necessary
• Explain the relevant hazards, precautions, and any changes to affected workers
• Give workers the instruction and training needed to carry out their roles safely

The person leading a confined-space risk assessment needs the practical knowledge to recognise the space, the planned work, and any conditions that can change during the job. Competence is about the specific task and hazards, rather than a job title alone.

Suitable knowledge and experience should cover the equipment, substances, entry method, isolation, atmosphere, rescue arrangements, and the limitations of proposed controls. The assessor must know when to seek further specialist advice.

A trained supervisor may have the right experience for routine work. An unusual configuration, uncertain atmosphere, or complex isolation may call for additional technical specialists before a safe decision can be made.

When outside contractors are engaged, the site controller and the contractor must coordinate. Both sides need enough information to understand the risks of the location and of the task they propose to carry out.

Written information is particularly useful where a tank, duct, chamber, or service void exists, even if entry is not planned at the beginning of the contract. A task can disturb the area or create a new hazardous atmosphere.

Those controlling the work should:

• Describe known hazards, connected equipment, previous contents, and precautions clearly
• Restrict access until entry has been specifically authorised through a task-based assessment and safe system

Every directly employed or contracted worker should:

• Follow the instruction, training, and agreed controls that apply to their role
• Report an unsafe condition, a change in the space, or a concern about protection promptly

The Confined Spaces Regulations 1997 address the foreseeable serious risks associated with work in a confined space and requires entry to be planned and controlled.

Its specific requirements work alongside the broader workplace duties, so complying with one document does not remove the need to consider the others.

The first question is whether the area is substantially enclosed and whether a specified risk is present or reasonably foreseeable from the area or the work.

If entry is contemplated, a competent assessment must identify the hazards and the safeguards needed for the actual activity.

Where a hazard can be eliminated, do that first. If it cannot, select effective measures to prevent exposure and control what remains.

Regulation 3 places the duties on employers and the self-employed. Regulation 4 forbids entry where the work can reasonably be done another way, and requires a safe system of work for any entry. Regulation 5 requires suitable and sufficient emergency arrangements to be in place before anyone enters.

The Confined Spaces Regulations 1997 applies to employers and self-employed people whose work falls within its scope.

Anyone directing the task or controlling the work needs to ensure that the arrangements required for their part of the job are actually in place, not merely mentioned on a form.

A company must account for temporary staff and contractors working under its direction, giving them the information, equipment, and instruction needed to follow the same safe system.

A self-employed person must manage risks to themselves and others affected by their work, and coordinate with the site controller and any additional workers.

Protection should follow the hazard and the task. A person entering as a contractor requires the same effective controls as a directly employed entrant facing the same conditions.

The first decision is whether the job can be done without sending anyone into the confined space.

Where a practical method avoids entry, assess it before planning an entry. Examples include external cleaning points, remote inspection cameras, long-reach sampling, or repositioning the work.

Ask these questions during planning:

• Could the required result be achieved from outside the space?
• Can a different tool, technology, or work sequence remove the need for a person to enter?

If entry remains necessary, document why and establish a suitable safe system of work before opening the space for entry.

If the task cannot reasonably be completed from outside, create a written safe system and make sure the team can follow it in the actual space.

It should describe:

• The task, location, people, and sequence of the planned work
• The hazards found during assessment and how each will be controlled
• The order of preparation, entry, work, exit, and handover
• What cleaning, isolation, ventilation, and atmospheric testing are required before entry

Assign a competent supervisor and arrange appropriate monitoring. The system must remain effective if circumstances change, not merely exist as paperwork.

A workable safe system brings together the following controls:

• A named supervisor with authority to stop the task
• People trained and competent for their assigned duties
• Reliable contact between entrants, attendants, and the supervisor
• An atmospheric testing plan, including further monitoring when conditions can change
• Ventilation appropriate to the source and location of contamination
• Isolation of moving equipment, incoming services, and stored energy
• Tools and equipment suitable for the atmosphere and the job
• Correctly selected and fitted protective equipment, including respiratory protection where needed

Use the code of practice as a practical reference when deciding how these elements work together. Any alternative method should provide an equivalent level of protection and be justified in the assessment.

Further details that a safe system should address include:

• Rescue and first aid arrangements matched to the foreseeable emergency
• Lighting that allows the work and safe exit to be seen clearly
• Ways to prevent or control ignition and fire
• Limits on time inside the space where heat, effort, or exposure requires them
• Clear individual duties so every worker knows what to check and when
• Supervision and communication throughout the activity

Record these arrangements and brief the team before work starts. If the task changes, stop, reassess, and update the safe system instead of improvising inside the space.

Prepare emergency arrangements before the first entrant goes in; Regulation 5 requires them before anyone enters. Rescue is a planned part of the work, not an improvised response after someone becomes unwell.

The plan should cover:

• Competent rescuers who can respond in time for the foreseeable incident
• Recovery, first-aid, and resuscitation equipment suited to the space and risk
• A dependable way to recognise trouble and raise the alarm
• Fire precautions and a clear evacuation route
• Training and practice for the people assigned emergency roles

External emergency services may be called when needed, but their arrival should not be the only rescue provision for a job where immediate action may be vital.

Confined-space work depends on the competence of everyone who plans, supervises, monitors, enters, and stands by for rescue. Each role involves different decisions and equipment.

The employer should check that:

• Supervisors can assess changes and enforce the agreed controls
• Workers recognise the hazards and understand the entry procedure
• Only people with the right capability and preparation are assigned to enter

Training needs to reflect the real task and be refreshed as equipment, methods, or risks change. A generic induction alone may not cover a specialist entry.

Training should help the team explain and apply:

• Their duties, including the duty to avoid entry where reasonably practicable
• The hazards in this specific space and how the chosen safeguards address them
• Each person’s tasks under the written safe system and how to communicate
• What to do if a control fails, an alarm sounds, or emergency help is needed

Assess whether entrants can safely perform the work and use the selected equipment. Health and physical suitability may be especially important for a demanding entry or for breathing apparatus.

A permit-to-work system can provide an additional check for a hazardous entry. It identifies the authorised job and makes important precautions visible to the people involved.

A suitable permit should:

• Be prepared and authorised by a person competent for that task
• Confirm that required isolations, tests, equipment, and rescue provisions are in place
• State the exact work, place, people, and period for which the permission applies

The permit supports the risk assessment and safe system of work. A signed form does not make an unsafe atmosphere safe, and changes to the job require a fresh decision.

Some specialist activities are controlled through separate regulatory arrangements rather than the usual confined-spaces provisions. The exclusions depend on the jurisdiction and the activity.

• The 1997 Regulations do not apply to ordinary shipboard work under the control of the master and crew, to work below ground in a mine, or to diving operations; each has its own specialist rules.
• Do not assume that an exemption removes the underlying hazard. Identify the applicable specialist rules and provide a suitable assessment, safe work method, competent team, and rescue arrangements.
• Where the ordinary confined-spaces requirements apply, a foreseeable specified risk in a substantially enclosed area calls for the appropriate entry controls.

All other situations where such a hazard exists in an enclosed space fall under these regulations.

The six specified risks are not the whole risk assessment. Other hazards can still injure an entrant or make a rescue more difficult.

For example:

• A trip at an awkward opening can lead to a fall into liquid or onto equipment
• Dim light, electrical faults, heat, cold, or poor footing can compound the job
• Tools, cleaning chemicals, high noise, and dust may create further exposure
• Weak communications or inadequate supervision can delay help when conditions change

Assess these hazards alongside the specified risks and choose controls that work together rather than creating new problems.

Workers have duties of their own and play an active part in keeping the system effective.

These include:

• Taking reasonable care for their own safety and for other people affected by their actions
• Cooperating with the employer and the planned protective arrangements
• Following their training, instructions, and the agreed entry method
• Reporting hazards, failed controls, or changing conditions without delay
• Using equipment and protective gear in the way they have been trained

These responsibilities arise under section 7 of the Health and Safety at Work etc. Act 1974. They work alongside, rather than replace, the employer’s responsibility to provide a safe system.