NF C 61-314 Figure C4 Extraction Force Verification Gauge

This NF C 61-314 Figure C4 Extraction Force Verification Gauge is precision-engineered to meet the exact specifications defined in NF C 61-314 Figure C4, specifically designed for verifying the extraction force of minimum opening contact tubes in 6A/250V and 16A/250V household and similar electrical socket systems. The gauge set comprises four distinct variants (C4A, C4B, C4C, C4D) engineered for specific device types, ensuring that contact tubes maintain the required retention force to prevent accidental disconnection. This directly addresses the standard’s critical requirement that the gauge must not disengage from the contact cell (alvéole) within the initial 30-second test period. By providing standardized and accurate extraction force measurement, this testing instrument ensures the safety, reliability, and regulatory compliance of electrical products conforming to NF C 61-314 standards.

Technical Specifications

• Full compliance with NF C 61-314 standard requirements, specifically engineered to Figure C4 specifications for extraction force verification
• Complete gauge set includes four precision variants (C4A, C4B, C4C, C4D) for targeted applications:
  • Gauge C4A (for 6A sockets): Diameter (a) 3.94±0.01 mm, applicable test weights 300g and 150g
  • Gauge C4B (for 16A sockets): Diameter (a) 3.80±0.01 mm, applicable test weights 400g and 200g
  • Gauge C4C (for 16A plugs): Diameter (a) 4.60±0.01 mm, applicable test weights 400g and 200g
  • Gauge C4D (for 16A plugs): Diameter (a) 4.86±0.01 mm, applicable test weight 2500g
• Manufactured from high-precision, durable materials to ensure dimensional stability and consistent test performance across repeated measurements
• Engineered for proper fit within minimum opening contact tubes without requiring forced insertion, ensuring accurate extraction force measurement
• Validates compliance with the core NF C 61-314 requirement: gauge must remain engaged in the contact cell for a minimum of 30 seconds

Test Procedure

1. Select the appropriate gauge variant (C4A/C4B/C4C/C4D) based on the test sample specifications (6A/16A socket or 16A plug) and verify that its diameter and tolerance parameters meet NF C 61-314 Figure C4 requirements.
2. Prepare the contact tube sample (cell/alvéole), ensuring…