Regulations 4(2) and 6(5)

## SCHEDULE 2E+W+SWhole-Body Vibration

### Part I-Daily exposure to vibrationE+W+S

The daily exposure to vibration (*A*(8)) of a person is ascertained using the formula:

where:

*a*_{w}is the vibration magnitude (root-mean-square frequency-weighted acceleration magnitude) in one of the three orthogonal directions, x, y and z, at the supporting surface;*T*is the duration of exposure to the vibration magnitude*a*_{w};*T*_{0}is the reference duration of 8 hours (28,800 seconds); and*k*is a multiplying factor.

To avoid confusion between vibration magnitude and daily exposure to vibration, it is conventional to express daily exposure to vibration in m/s^{2} A(8).

Daily exposure to vibration (*A*(8)) is evaluated separately for the x, y and z directions of vibration.

For horizontal vibration (x and y directions), *k* = 1.4 and *a*_{w} is obtained using the W_{d} frequency weighting. For vertical vibration (z direction), *k* = 1.0 and *a*_{w} is obtained using the W_{k} frequency weighting.

Definitions for the frequency weightings are given in International Standard ISO 2631-1:1997.

If the work is such that the total daily exposure consists of two or more operations with different vibration magnitudes, the daily exposure (*A*(8)) for the combination of operations is ascertained using the formula:

where:

*n*is the number of individual operations within the working day;*a*_{wi}is the vibration magnitude for operation*i*; and*T*i is the duration of operation*i*.

### Part II-Exposure to vibration averaged over one weekE+W+S

The exposure to vibration averaged over one week (*A*(8)_{week}) is the total exposure occurring within a period of seven consecutive days, normalised to a reference duration of five 8-hour days (40 hours). It is ascertained using the formula:

where:

*A*(8)j is the daily exposure for day*j*.

The exposure to vibration averaged over one week is for use only for the purposes of Regulation 6(5).