| Main product | OEM product | |
| Certified stack/physical layer |
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| Non-certified stack/physical layer |
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Note 1: Required documentation if KNX member takes recourse to a subcontractor company which is ISO 9001 certified for the scope "Design, Manufacturing and final product inspection/testing":
- ISO 9001 certificate of subcontractor
- Declaration from the subcontractor that the relevant product is developed and produced at his premises, thereby listing the commercial product name and order number.