Quick Hits

🗓️ MAY 13, 2026
⚡ GROUNDING & BONDING — EP 4

Objectionable Current on Metal Parts (NEC 250.6)
joshthesparky4 · Josh The Sparky

Opening Hook
If you see current on metal parts — that’s NOT “normal.” ⚠️
That’s a system design or wiring fault under NEC.

Episode Overview
Quick breakdown of objectionable current and why NEC 250.6 exists to stop neutral current from ending up on equipment grounding paths and metal enclosures.

This is where “it still works” turns into real shock risk.

Core Idea
⚡ Objectionable current = unintended neutral current on metal parts

• Metal enclosures should NEVER carry load current
• Grounding paths are for fault clearing ONLY
• Neutral current must stay on the grounded conductor system

👉 If it’s on metal, something is wrong upstream

Code Breakdown
NEC 250.6(A) — Objectionable Current
• Systems must be arranged to prevent unwanted current on equipment grounding conductors
• Bonding/neutral arrangements must not create parallel neutral paths

NEC 250.6(B) — Permitted Corrections
• You can modify bonding to eliminate objectionable current
• BUT you cannot interrupt or compromise the fault-current path

👉 Fault clearing path ALWAYS stays intact

Why It Matters
⚡ Metal parts can become energized
💀 Parallel neutral paths create hidden current flow
🔥 Intermittent nuisance shocks and equipment issues
⚠️ Breakers may never trip — but hazards still exist

Common Field Mistakes
• Shared neutral/ground paths in subpanels
• Multiple neutral-to-ground bonds downstream
• Bootleg neutrals on receptacles
• Ignoring parallel return paths in retrofits

Core Takeaways
• Objectionable current is a design/wiring problem
• Neutrals and grounds must stay separated after service disconnect
• Fault path integrity is non-negotiable
• Fix the system — don’t “work around” it

Final Takeaway
If the current is on the metal, the system is fighting itself. ⚡
NEC doesn’t just care that it works — it cares how it works safely.

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