Quick Hits

Episode 2: Power Sources for Control Circuits (522.10)

SLIDE 1 (HOOK / COVER)

⚡ NEC Quick Hit: Control Power Sources (Part 2) ⚡

How are power-limited versus non-power-limited control circuits powered and protected in amusement attractions? Let's check Section 522.10! 👇

SLIDE 2 (POWER-LIMITED CONTROL CIRCUITS)

Strict Power Caps:

• Maximum Ratings: Power-limited control circuits must be supplied from a source with a rated output of not more than 30 volts and 1000 volt-amperes.

• Transformers & OCPDs: Control transformers must comply with Article 450 Parts I and II. Other power sources must be protected by OCPDs rated at not more than 167 percent of the source's VA rating divided by its rated voltage, with non-interchangeable fusible links.

• Output Ceilings: To comply with the 1000 VA limit, alternative power sources are capped at a maximum output of 2500 VA, and the product of max current and max voltage cannot exceed 10,000 VA (determined with OCPD bypassed).

SLIDE 3 (NON-POWER-LIMITED CONTROL CIRCUITS)

Higher Capacity Systems:

• Voltage & Power Limits: Non-power-limited control circuits must not exceed 300 volts, and their power output is not required to be limited.

• Protection Rules: Non-power-limited sources other than transformers must be protected by OCPDs rated at not more than 125 percent of the source's VA rating divided by its rated voltage.

SLIDE 4 (WRAP-UP)

💡 Apprentice Pro-Tip: Always verify whether your amusement ride control power source falls under the 30V/1000VA power-limited rule or the higher-capacity non-power-limited category before selecting overcurrent protection!

💬 Save this post for your next ride control panel build!

🔗 More code breakdowns at www.JoshTheSparky.com

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