Deciphering 2018 IECC—Automatic Time Switch Control

Automatic Time Switch Controls have been a mainstay in IECC standards. The 2018 IECC revision makes a few additional clarifications to the time switch control language, but the message and methods largely stay the same from the 2015 version.

In summary, automatic time switches are required in all areas that are not controlled by an occupancy sensor. The switch must also have a manual override. As specifically noted in 2018, that override must be located in a place where occupants have ready access.

Summary of 2015 and 2018 IECC Requirements
C405.2.2.1 Automatic Time Switch Control

Automatic Time Switch Table

For more information and tools for 2018 IECC, visit


Compliant Time Switch Controls from Leviton

Enable advanced, easy-to-manage time switch controls with Leviton solutions engineered to meet energy code compliance requirements.

GreenMAX® DRC Room Control System and Sapphire™ Room Controller
Combine these two solutions for easy to program time switch controls and distributed control with a touchscreen interface and multi-way switching for easy user access and manual control or override.


EZ-MAX® Plus
Ideal for smaller, standalone applications for simple time switch control. Connect switches, sensors and photocells for a comprehensive, yet simple code compliant solution.

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