Compatible Electronics

Ground Continuity & Protective Bonding Testing Services

Ground Continuity & Protective Bonding Testing Services

Compatible Electronics performs ground continuity and protective bonding testing as a mandatory component of NVLAP-accredited safety evaluations at our laboratory (Lab Code 200527-0). A failed ground continuity test is one of the most common causes of safety test failure — and a critical protection against electric shock.

NVLAP Lab Code 200527-0 ISO/IEC 17025:2017 IEC 60204-1 · IEC 60335-1 · IEC 60601-1 Lake Forest · Brea · Newbury Park

What is Ground Continuity Testing?

Ground continuity testing — also called protective bonding or earth continuity testing — verifies that a low-impedance path exists between the mains supply earth terminal and all accessible conductive parts of the equipment. This path ensures that a fault current flowing through the equipment will trip the circuit breaker or fuse rather than flow through a user, preventing electric shock.

The test passes a high current (typically 10–25 A AC) through the protective earth circuit and measures the resulting resistance or voltage drop. Most IEC safety standards require the resistance between the supply earth pin and any accessible conductive part to be below 0.1 Ω. Ground continuity testing is always performed alongside dielectric strength testing and leakage current testing as part of a complete electrical safety evaluation.

💡 Common failure causes: Ground continuity failures typically result from loose earth connections, inadequate conductor cross-section, paint or anodising between bonded parts, insufficient thread engagement on earthing screws, or missing earth bonding jumpers on hinged panels.

Standards Requiring Ground Continuity Testing

  • IEC 60204-1 — Clause 18.2: Protective bonding circuit continuity test (25 A)
  • IEC 60335-1 — Clause 27: Resistance to heat and fire; earthing continuity
  • IEC 60601-1 — Clause 8.6.5: Protective earth resistance
  • IEC 62368-1 — Clause 5.6: Protective bonding
  • IEC 61010-1 — Clause 6.6: Protective earth impedance
  • EN 957 — Earth continuity for fitness equipment
  • IEC 61851 — Protective bonding for EV charging equipment
  • IEC 60730-1 — Earth continuity for automatic controls

Ready to Get Your Product Tested?

Contact our safety engineers for a quote or to discuss your testing requirements.

Ready to

get started?