189.1. Where a person does setup work, apprenticeship work, a search for defects or cleaning work requiring that a protector be moved or removed or that a protection device be neutralized in the danger zone of a machine that must remain, in whole or in part, in operation, the machine must be equipped with a specific control mode whose engagement must cause all other control modes of the machine to become inoperative and allow(1) the dangerous parts of the machine to be operated only by using a control device requiring continuous action or a two-hand control device, or by continuous action of a validation device; or
(2) the machine to be operated only in conditions where the moving parts do not involve any danger for the health, safety and physical well-being of persons having access to the danger zone, for instance, at reduced speed, under reduced tension, step-by-step or by means of a separate step control device.