CSA C22.2 No. 88:19 Industrial heating equipment.
The location of terminal boxes or compartments in which supply connections are made shall be such that connections will be readily accessible for inspection after the equipment is installed as intended, but not without opening a cover which shall be secured by screws or the equivalent.
Note: if supply terminals ore in the same comportment as readily accessible fuses, the access door may be of the snap-catch type provided it is marked as required by Clause 5.5.
4.5.2 TermInal parts and leads
Wire-binding terminal parts and the identification of terminal parts and leads shall comply with the requirements of CAN/CSA-C22.2 No. 0.
Fixed wiring terminals shall be prevented from turning, and shall thread into metal. Friction between surfaces is not an acceptable means of preventing the turning of terminal parts, but a suitable lotkwasher is, if properly applied.
Permanently connected equipment requiring electrical connection to a neutral conductor shall have one terminal or lead identified for the connection of the identified conductor of the supply circuit if the equipment has lampholders, element holders of the screw-shell type, single-pole switches, or automatic controls having a manually-operable single-pole switch.
4.5.3 Cord-connected equipment
Cord-connected equipment shall be provided with a suitable length of flexible cord or cable complying with CSA C22.2 No. 49 or CSA C22.2 No. 92, having a bare conductor or an insulated conductor finished to show a green or green with yellow stripe colour for bonding exposed non-current-carrying metal parts.
Attachment-plug caps shall comply with CSA C22.2 No. 42, shall have a suitable rating, and shall be provided with a grounding blade which will effectively ground the equipment before any live contact is made.
Flexible cords shall have an ampacity not less than the current rating of the equipment.
Flexible cords shall be provided with strain relief so that mechanical stress on the cords will not be transmitted to terminals, splices, or wiring.
Thermal insulation shall be adequately enclosed and retained to prevent loss and shifting.
4.8 Current-carrying parts
Current-carrying parts including electrodes shall have adequate mechanical strength and current-carrying capacity for the service and shall be of metal suitable for the application.
Copper wires and parts shall not operate at temperatures higher than 180 °C except that tinned or plated copper may be accepted at temperatures up to 218 °C.
CSA C22.2 No. 88 pdf download.