Guidance Note 31 – Vibration

This Guidance Note gives practical information about managing exposure to vibration.

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Appendices 1-3 provide further information to supplement that found in the body of this Guidance Note. Appendices 4 & 5 provide sample checklist templates. If you wish to use the templates in Appendix 4 & 5 to construct your own documents, you must ensure that all references to Alcumus SafeContractor Accreditation have been removed and the final documents are clearly incorporated into your existing safety management system.

What is vibration?

Vibration exposure at work is split into two areas, hand-arm and whole body vibration.

Hand Arm Vibration (HAV)

It is estimated that around five million workers are exposed to hand-arm vibration in the workplace. Two million of these workers are exposed to levels of vibration where there are clear risks of developing disease. Hand-arm vibration is vibration transmitted into your hands and arms when you use hand-held powered work equipment.

Regular exposure to HAV can give rise to permanent injuries such as:

Whole Body Vibration (WBV)

Whole-body vibration is shaking or jolting of the human body through a supporting surface (usually a seat or the floor), for example when driving or riding on a vehicle along an unmade road, operating earthmoving machines or standing on a structure attached to a large, powerful, fixed machine which is impacting or vibrating.

Regular long term exposure to WBV is associated with back pain alongside other factors such as poor posture and heavy lifting. Employers should look out for WBV risks where any commercial/industrial/construction vehicles are driven regularly for most of the day.

Drivers of some mobile machines, including certain tractors, fork lift trucks and quarrying or earth-moving machinery, may be exposed to WBV and shocks, which are associated with back pain. If employers comply with appropriate legislation and follow guidance, it may be possible to reduce excesses of back pain from whole-body vibration. There are simple, non-technical and common sense measures which can be introduced to reduce exposure to vibration. The regulations introduce action and limit values for hand-arm and whole-body vibration.

What must I do?

An employer who carries out work which is liable to expose any of his employees to risk from vibrations, shall make a suitable and sufficient assessment of the risk created by that work to the health and safety of those employees and the risk assessment shall identify the measures that need to be taken to meet the requirements of the Regulations.

Please refer to separate Guidance Note on risk assessment in the document library.

An assessment of the vibration risk ensures that a valid decision accounting for the actual encountered levels of exposure is made. This determines what actions need to be taken to adequately control the exposure. Please refer to the relevant checklists at the end of this Guidance Note.

To carry out a suitable and sufficient risk assessment, you need to know what the exposure limit values and exposure action values are;

The Exposure Limit Value (ELV) is the maximum amount of vibration an employee may be exposed to in a single day.

The Exposure Action Value (EAV) is a daily amount of exposure above which employers must take action to control exposure.

the exposure action value (EAV) is a daily amount of vibration exposure above which employers are required to take action to control exposure. The greater the exposure level, the greater the risk and the more action employers will need to take to reduce the risk. For handarm vibration the EAV is a daily exposure of 2.5 m/s2 A (8).

There is also a level of vibration exposure that must not be exceeded. This is called the exposure limit value.

The exposure limit value (ELV) is the maximum amount of vibration an employee may be exposed to on any single day. For hand-arm vibration the ELV is a daily exposure of 5 m/s2 A (8). It represents a high risk above which employees should not be exposed.

(Exposure Values are expressed in m/s2 A (8). See appendix 3 for a full explanation of this term).

Group your work activities according to whether they are high, medium or low risk. Plan your action to control risks for the employees at greatest risk first. Your rough groupings could be based on the following:

High risk (Above the ELV)

Employees who regularly operate:

Employees in this group are likely to be above the exposure limit value set out in the Regulations. The limit value could be exceeded in a much shorter time in some cases, especially where the tools are not the most suitable for the job.

Medium risk (Above the EAV)

Employees who regularly operate:

Employees in this group are likely to be exposed above the exposure action value set out in the Regulations.

To help in the estimation of exposure the Health and Safety Executive have Vibration Calculators on their website: for hand arm vibration and for whole body vibration.

The above example shows the results for an operative using a hammer drill with a vibration level of 9m/s2 for a trigger time (actual time in contact with the vibration source) of 1Hr 30 minutes and an angle grinder with a vibration level of 6m/s2 for a trigger time of 45 minutes during the same day. This gives a total daily exposure level of 4.3m/s2 A (8) which is above the Exposure Action Value of 2.5 m/s2 A (8), but not the Exposure Limit Value of 5m/s2 A (8). If this is the regular level of work, action is required to reduce the exposure to vibration.

If you do not have access to the internet, you can use the simple ‘exposure points’ system below to estimate the daily exposure.

Multiply the points assigned to the tool vibration by the number of hours of daily ‘trigger time’ for the tool(s) and then compare the total with the exposure action value (EAV) and exposure limited value (ELV) points.

100 points per day = exposure action value (EAV)
400 points per day = exposure limit value (ELV)

It is necessary to be aware of the available and appropriate measures for controlling the risk. Control measures that may be adopted to reduce or control exposure include:

Hand arm vibration

Whole body vibration

(Please note these lists are not exhaustive)

Where required, ensure that:


Further Guidance