All employees covered by the Workplace Safety and Insurance Board are required to have First Aid equipment, facilities, and trained personnel in all work places. (See regulation 1101 for full details of the First Aid Act).

Every employer employing not more than five workers in any one shift at a place of employment shall…ensure that the first aid station is at all times in the charge of a worker who is the holder of a valid Basic First Aid certificate.

…more than five workers in any one shift at a place of employment shall…ensure that the first aid station is at all times in the charge of a worker who is the holder of a valid Standard First Aid certificate.

In other words…
<5 per shift = Basic First Aid Certificate
>5 per shift = Standard First Aid Certificate