I was always taught and now teach , that were the word " shall" is used in the regulations it becomes non negotiable regulation . If the sentences says " may " then it provides for a choice.
The problem we find the majority of the time is that the guys do not read/understand the regulations when performing the work and when the problem arises they go to read the regulations and look for a clause to get them out of trouble, not to see if they have done it correctly .
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