jaspector
§ Chapter 43 IRC 2021

Class 2 Remote-Control, Signaling and Power-Limited Circuits

8 entries from Chapter 43 of IRC 2021, organized by section number. Each entry covers what the code requires, why it exists, what inspectors look for, and common mistakes.

ED IRC 2018 ED IRC 2021 ED IRC 2024
§ 01   Sections

All 8 entries.

Sorted by section number. Click any row for the full entry — answer, requirements, edition diff, related sections.

Doorbell Wiring Is Usually a Class 2 Low-Voltage Circuit
E4301.1
Is doorbell wiring covered by electrical code?
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Cable TV and Telephone Wiring Are Low Voltage but Not Automatically Class 2
E4301.2
Can cable TV or telephone wires share holes and boxes with electrical wiring?
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Class 2 Transformers and Power Supplies Must Be Listed and Accessible
E4302.1
Can a doorbell or thermostat transformer be hidden in a wall?
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Low-Voltage Landscape Lighting Still Needs a Listed Power Source and Proper Cable
E4302.1
Does low-voltage landscape lighting have to follow electrical code?
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Thermostat Cable Must Stay Within the Class 2 Circuit Rules
E4303.1
Can I run thermostat wire myself for a furnace or smart thermostat?
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Class 2 Cable Must Be Supported and Protected from Damage
E4303.2
How should low-voltage cable be run through walls, attics, and basements?
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Security and Alarm Cables Need Class 2 Separation and Protection
E4303.3
What code applies to security system wiring in a house?
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Class 2 Conductors Usually Need Separation from Power Conductors
E4303.4
Can low-voltage wires be in the same conduit or box as 120-volt wiring?
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§ 02   Chapter navigation