Maintenance requirements for electrical equipment

NFPA Standard 70 is a national legislative of the USA and also can be used as good practice. IATF 16949 is a standard for the management system and that is a different perspective, requirements for electrical equipment are basic.

IATF 16949 is setting requirements for the system and NFPA Standard 70 is something you must comply with. NFPA Standard 70 has a short scope focused on electrical equipment. 

Here are some articles that may help regarding IATF 16949:

What is IATF 16949: https://advisera.com/16949academy/what-is-iatf-16949/ 

Key benefits of IATF 16949 implementation: https://advisera.com/16949academy/knowledgebase/key-benefits-of-iatf-16949-implementation/