Articles 90.6 and 90.7 of the National Electrical Code (NEC) address formal interpretations and the examination of equipment for safety, ensuring uniformity and reliability in the application of the Code.
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Article 90.6: Formal Interpretations
Purpose:
- To promote uniformity in the interpretation and application of the NEC.
- Formal interpretation procedures are established in the Regulations Governing the Development of NFPA Standards.
Article 90.7: Examination of Equipment for Safety
(A) Basis for Approval
- Equipment and materials referred to in the Code are examined for safety under standard conditions.
- These examinations provide a basis for approval when the results are made publicly available by qualified organizations.
- This process avoids:
- Repetition of examinations by different parties.
- Conflicting reports on the suitability of devices and materials.
(B) Factory-Installed Wiring and Equipment
- Intent: Factory-installed internal wiring or equipment construction does not need to be inspected at the time of installation, except to detect alterations or damage.
- Condition: The equipment must be listed by a qualified electrical testing laboratory that:
- Has adequate facilities for testing and inspection.
- Requires suitability for installation in accordance with the NEC.
- Suitability: Determined by applying requirements compatible with the NEC.
Informational Notes:
- Informational Note No. 1: Refer to 110.3 for guidance on safety examinations.
- Informational Note No. 2: Refer to Article 100 for definitions of Listed and Reconditioned.
- Informational Note No. 3: Refer to Informative Annex A for a list of product safety standards compatible with the NEC.
Summary of NEC Articles 90.6 and 90.7
| Article | Description |
|---|---|
| 90.6: Formal Interpretations | Ensures uniformity in Code interpretation through established NFPA procedures. |
| 90.7: Examination of Equipment | Provides a basis for equipment approval through standardized safety examinations. |
| Key Points | – Avoids repetitive or conflicting examinations. – Factory-installed wiring typically does not require inspection unless altered or damaged. |
| Informational Notes | Refer to 110.3, Article 100, and Annex A for additional guidance and definitions. |
Why This Matters
- Article 90.6 ensures consistent application of the NEC, reducing confusion and discrepancies.
- Article 90.7 streamlines the approval process for equipment, ensuring safety while minimizing redundant inspections.