The abrasion procedure shall be performed on every device in which the strap is in contact with a rigid part of the belt. However, the type 1 abrasion test (2.7.3.6.4.1) need not be carried out on the belt-adjusting device where the micro-slip test (2.7.4 ) shows that the strap slips less than half the prescribed amount. The setting on the test apparatus shall approximately maintain the relative position of strap and contact area.
