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Despite your excellent technical knowledge, it is obvious that you have no actual North American field experience.Mr Che said:b) The OL's N.C. contact (95) (96) shown between coil M and line X2 is Wrong. This is switching on the grounded Neutral line, a violation of IEC/IEEE/NEC/CSA document. It shall be wired ahead of coil M.
The Allen-Bradley brand as well as all other manufactures in North America publish standard wiring diagrams.Waross said:Shown here is typical factory pre-wiring of a typical magnetic motor starter in North America.
This is an approved assembly, and the NEC rules for field wiring do not apply.
Recently in Canada was about 50 years ago.Mr. Che said:3. A similar case, the use of two heater overload for three phase motor had been the practice for the past 60+ years ! It is only recently that the mistake been corrected that three heaters shall be used on the three ungrounded conductors.