Quick Hits

Episode 3: Disconnecting Means, Motor Overloads & Grounding (460.10 – 460.13)

SLIDE 1 (HOOK / COVER)

⚡ NEC Quick Hit: Disconnects & Motor Overloads (Part 3) ⚡

Simultaneous disconnects, power-factor-adjusted motor overloads, and mandatory nameplate data—let's review Sections 460.10 through 460.13! 👇

SLIDE 2 (DISCONNECTING MEANS & MOTOR OVERLOADS)

Isolating and Protecting Circuits:

• Simultaneous Disconnect: A disconnect must open all ungrounded conductors simultaneously, with an ampacity rating not less than 135 percent of the capacitor's rated current.

• Motor Overload Adjustment: When a capacitor is connected on the load side of motor overload devices, the overload rating/setting must be adjusted downward based on the improved power factor.

SLIDE 3 (GROUNDING & NAMEPLATES)

Cases and Nameplate Markings:

• Grounding Cases: Capacitor cases must be connected to the equipment grounding conductor (unless supported on structures designed for non-ground potential).

• Mandatory Nameplate Details: Nameplates must state the manufacturer, rated voltage, frequency, kVAr or amperes, phases, liquid volume/type, and internal discharge device status.

SLIDE 4 (WRAP-UP)

💡 Apprentice Pro-Tip: When installing power factor correction capacitors on the load side of motor starters, make sure to scale down your motor overload relay settings to match the reduced line current!

💬 Save this post for your next motor control diagnostic check!

🔗 More code breakdowns and study tools at www.JoshTheSparky.com

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