Quick Hits

Episode 3: Conductor Materials, Sizing & Ampacity (522.20 – 522.23)

SLIDE 1 (HOOK / COVER)

⚡ NEC Quick Hit: Control Conductors & Ampacities (Part 3) ⚡

Can you use 30 AWG wire in a theme park control panel? How do you size ampacities for small control conductors? Let's review Sections 522.20 through 522.23! 👇

SLIDE 2 (CONDUCTOR MATERIALS & SIZING)

Copper & Tiny Conductors:

• Copper Mandate: Insulated control circuit conductors must be copper (stranded or solid), except busbars, slip rings, and specific-purpose devices like thermocouples or RTDs.

• Conductor Sizing by Location:

  • Within listed components/assemblies: Size 30 AWG or larger is permitted.

  • Within enclosures/operator stations: Jacketed multiconductor cables can be 30 AWG+, non-jacketed ribbon cables down to 26 AWG, and single conductors down to 24 AWG.

  • Outside enclosures: Jacketed multiconductor cables cannot be smaller than 26 AWG; single conductors cannot be smaller than 18 AWG and must be part of a recognized Chapter 3 wiring method.

SLIDE 3 (AMPACITY & OVERCURRENT PROTECTION)

Table 522.22 Lookups:

• Small Conductor Ampacities: Ampacities for 16 AWG and smaller follow Table 522.22 (e.g., 30 AWG = 0.5A, 24 AWG = 2A, 18 AWG = 7A, 16 AWG = 10A at 75°C).

• Overcurrent Protection (522.23): Conductors from 30 AWG through 16 AWG require OCPD matching their Table 522.22 ampacity, while conductors larger than 16 AWG follow Table 310.16.

SLIDE 4 (WRAP-UP)

💡 Apprentice Pro-Tip: When applying ambient temperatures other than 30°C to small amusement control wires, you must apply the standard temperature correction factors from Section 310.15(B)(1)!

💬 Save this post for your next control wiring reference!

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