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What does the V-MAC tell you?

What's on the output tabs?

A load weight/frequency graph

This is based on the load weight/frequency graph in the MAC. It has been flipped round and scaled.

Blank load weight/frequency graph

Vertical bars on the graph summarising the data you have entered

  • These are calculated and appear automatically. The screen grab below is from the first worked example. The tall coloured bars are 'summary bars' that tell you about the overall demands of the job. The smaller pale blue bars and the values above them show the numbers of items handled in 1 kg steps.
  • Vertical bars on the graph summarising the data you have entered

    A shift length box

    This is for you to enter the actual shift length (in hours and minutes). The boundaries of the graph move to take account of the shift length.

    A summary table

    Summary table from first worked example

    There is more detailed information about interpreting the summary table below and in the FAQs.

    An explanation of the colour bands

    They are the same as in the MAC and indicate risk level: Your aim should be to reduce the risks by moving risk levels towards the 'Green' colour band.

    Colour band What it means Action to take
    white P in a purple box Very high level of risk
    Such operations may represent a serious risk of injury and should come under close scrutiny.
    Eliminate these lifting operations as the highest priority.

    white R in a red box

    High level of risk - Prompt action needed
    This may expose a significant proportion of the working population to risk of injury.
    Ask if you can:
    • Eliminate manual handling of these items?
    • Reduce the item weights?
    • Reduce the number of lifts per day of these items?
    If any of the summary value bars fall into this zone, take prompt action to reduce the overall load handled.

    white A in an orange box

    Medium level of risk - Examine tasks closely Ask if you can:
    • Reduce the item weights?
    • Reduce the number of lifts per day of these items?

    white G on a green background

    Low level of risk Consider the vulnerability of special risk groups (such as pregnant women, or young workers) where appropriate.

    How to interpret the data - first look at the weights of individual loads

    The V-MAC takes the weights you enter and rounds them to the nearest kilogram. It then plots them on the graph so the height of each bar represents the number of times that a particular weight is handled in a shift. The number of lifts of that weight is shown above each bar.

    Number of lifts shown above each bar

    Think about the risks from these individual loads first. Start with the heaviest weight and ask what it is and why it is being handled in the way it is.

    Then ask if you can, as far as is reasonably practicable:

    Use the Excel workbook to ask 'What if …?' questions and to see the effect on the graph. For example, if someone handles 300 items weighing 30 kg, you might decide to replace them with 600 items each weighing 15 kg. That would make individual loads lighter but increase the total number of lifts the worker carries out.

    Once you have looked at the heaviest weight, work from right to left across the graph so you look at the next heaviest weight until you reach the 'Green' zone.

    Start with heaviest weight and work left across the chart

    How to interpret the data - use the summary bars to look at the overall demands of the job

    After looking at the individual loads, you should look at the summary bars on the graph and in the summary table.


    See also

    Updated: 2021-01-26