2020 National Electrical Code
NEC 2020 – What to Expect: Significant Changes and Adoptions by State
It seems like we just started using the 2017 National Electrical Code, and now the 2020 version is available. There have been significant changes, accomplished through public comment and hard work by the Code Making Panels and others. What are some of the important changes that will affect installers, electricians, and AHJ’s? We are eager to know what has been changed. Just as importantly, when can we reasonably expect that the new version of the Code will be adopted? Each state must decide when to move to the next edition of the NEC.
2020 NEC Changes to 430.122 Conductors – Minimum Size and Ampacity
Changes to the 2020 NEC include the addition of several paragraphs in section 430.122. These changes will help the user to determine the correct ampacity for conductors used with power conversion equipment. The Adjustable Speed Drive is one type of power conversion equipment that provides a means of adjusting the speed of an electric motor, 100. A Variable Frequency Drive, VFD, is an adjustable speed drive that controls the speed, the RPM, of a motor by controlling the frequency and voltage supplied to a motor. The changes made in 430.122 Conductors – Minimum Size and Ampacity apply to Adjustable Speed Drive Systems.
Grounding Systems Permitted to Be Connected on the Supply Side of the Disconnect
Section 250.25 is brand new for the 2020 Code cycle. It has been created to establish grounding and bonding rules for add-on disconnects, such as a PV system disconnect acting as that PV system’s service equipment, when the disconnect is attached to conductors on the supply side (meaning before the main cut-off) of the utility service disconnect.
Section 230.82 provides electricians with a list of equipment/systems that can legally connect to the conductors on the supply side of an electrical system serving a home or business. The new Section 250.25 outlines grounding and bonding rules for a disconnect serving just such an add-on system.
New Articles in the 2020 NEC
There will be four new article additions to the 2020 NEC:
1. Article 242 Overvoltage Protection
2. Article 311 Medium Voltage Conductors and Cable
3. Article 337 Type P Cable
4. Article 800 General Requirements for Communications Systems