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Its the term itself which is ambiguous - pvc sheath provides 'mechanical protection' so does SWA but on very different levels.
Mechanical protection does not mean necessarally protection to a high degree of impact or piercing but when it is worded in combination with regulations which clearly mean you are providing a high degree of protection then yes it can be assumed to relate to steel conduit, plate or armour.
Its like saying the pvc jacket of T&E is there to provide mechanical protection albiet a low level - technically it does but it would be better to say the pvc jacket is there to provide environmental protection of which one trait is a low level of mechanical protection, it also provides many other traits of protection from insulation to UV tolerance again in the example of standard T&E it would it would be a low UV tolerance.
Wording is key here and depends on the subject of discussion to what would be assumed it represents.
Mechanical protection does not mean necessarally protection to a high degree of impact or piercing but when it is worded in combination with regulations which clearly mean you are providing a high degree of protection then yes it can be assumed to relate to steel conduit, plate or armour.
Its like saying the pvc jacket of T&E is there to provide mechanical protection albiet a low level - technically it does but it would be better to say the pvc jacket is there to provide environmental protection of which one trait is a low level of mechanical protection, it also provides many other traits of protection from insulation to UV tolerance again in the example of standard T&E it would it would be a low UV tolerance.
Wording is key here and depends on the subject of discussion to what would be assumed it represents.