PART XXVI ELECTRICAL OPERATIONS — Control systems - general requirements

Where practicable and required to minimize risk to workers, a control system shall be designed so that

the controlled equipment cannot be inadvertently activated;

an effective basic diagnostic capability is incorporated;

hardwired emergency stop devices are provided at operator stations; and

operator controls other than emergency stop devices can be activated at only one station at a time.

A control system shall be used to prevent automatic startup after a power interruption or low voltage occurrence where automatic startup in those circumstances is likely to create a hazard to workers.

A control system shall be designed, where practicable, so that the controlled equipment does not create a hazard to workers where the system fails or is shut down.

Equipment operated by a new or altered control system shall not be used until the control system has been thoroughly checked and tested to verify that it functions in the intended manner.

An employer shall ensure that there is up-to-date documentation that is readily available to an affected worker that describes the design, installation, operation and maintenance of a control system.

Control system hardware shall be protected from circumstances that could adversely affect the performance of the system, including mechanical damage, vibration, extreme temperatures or humidity level, high electromagnetic field levels and power disturbances.

Written safe work procedures shall be developed for the use of equipment operated by a control system, including lockout procedures as required by these regulations.