One of the items which should be coordinated between owner and electricity supervisor is type and material of electricity pipe.
At the present time regarding clause 13-7-3-3-2 page 90 of subject 13 of building national system (last version 1395) using of Poly amid pipes or other plastic pipes which ignite and burn next to fire, is completely prohibited. But unfortunately still due to the low price of these pipes and similar pipes as Poly amid, Poly ethylene and corrugated, they are mostly interested.
While the consequences of pipe firing in the building is very high as they are built-in and causes high costs for residents. It’s better to pay more initial cost to principled implementation of electrical installations and compliance with standards including providing safety and think about the life and fund of ourselves and the other people in the future and also equipment.
In this line due to table 13-7-3-2 page 90 of subject 13 of engineering building national system, the allowed pipes are specified in which steel pipes and non-self-burning hard plastics (which is PVC) are allowed. It’s necessary to mention that certainly PVC electrical pipes should hold standard 11215-211 and strength to mechanical impact and pressure.
Off course corrugated pipes are just allowed to be used if their material is PVC and for building use and un-industrial and also built-in use. (using on wall is prohibited in any terms)
Due to the current situation maybe the engineers’ duty is convincing the constructors and owners for correct installation of these pipes to avoid unpleasant accidents. It’s better to written announce the owner about this matter at the beginning of building project.