Document ID: chunk:federal_register_of_legislation:F2016L00422:body:0:p27
Version: federal_register_of_legislation:F2016L00422
Segment Type: other
Provision Reference: 
Character Range: 66372–69118

with workpieces, where these need to be visible through the guarding.

Removal of guarding
If any type of guarding is removed for the purposes of maintenance or cleaning, it must be replaced before the plant is put back into normal operation. The plant should not be able to restart unless the guarding is in place. When removing guarding, eliminate the energy source by disconnecting the power supply or by locking out motive power sources.

4.2 Operator controls

Regulation 210: A person with management or control of plant at a workplace must ensure that any operator controls are:

    * identified so as to indicate their nature, function and direction of operation
    * located so they can be readily and conveniently operated
    * located or guarded to prevent unintentional activation, and
    * able to be locked into the "off" position to enable disconnection from energy sources.

Badly designed operator controls can lead to unintentional and unsafe operation of plant. For example, a control for setting the speed on a saw should not be a simple slider or rotary control that may be accidentally adjusted during operation. It should be graduated in fixed lockable steps.

Operator control devices should be designed:
    * to enable the plant to be 'fail safe'. For example, when hand pressure is released on a lever controlling up and down movement, the lever will return to the neutral position and movement will stop
    * to be within easy access of the operator
    * so the intended function can be easily read and understood, especially in the case of dials and gauges
    * so the movement of the control is consistent with established convention, for example anticlockwise to open, clockwise to close
    * so the desired effect can only occur by intentional operation of a control, for example provision of a starting control
    * to withstand the rigours of normal use, undue forces and environmental conditions,
    * so they are located outside danger zones, and
    * so they are readily accessible for maintenance.

4.3 Emergency stops

Regulation 211: If the design of plant at a workplace includes an emergency stop control, the person with management or control of the plant must ensure that:

    * the stop control is prominent, clearly and durably marked and immediately accessible to each operator of the plant
    * any handle, bar or push button associated with the stop control are coloured red, and
    * the stop control cannot be adversely affected by electrical or electronic circuit malfunction.

Where plant is designed to be operated or attended by more than one person and more than one control is fitted, the multiple controls must be of the "stop and lock-off" type so that the plant cannot be