Explanation of NEC Section 400 regarding flexible cords and cables
Section 400 of the National Electrical Code Focuses on the use of flexible ropes and cables in electrical installations. Flexible ropes and cables are portable wiring harnesses made of stranded conductors with durable, flexible insulation, used to provide power to mobile or temporary equipment where fixed wiring is not suitable. While these cables are flexible […]
2026 NEC Code Changes: Key Impacts on Electrical Contractors – Microgrids and Critical Systems
EC&M Editor-in-Chief, Ellen Parson, discusses “2026 NEC Code Changes: Key Impacts on Electrical Contractors” with subject matter expert Chad Kennedy, director of industry standards at Schneider Electric. In this third and final part of three video interviews, we’ll explore several of NEC’s key revisions to microgrids and critical systems — and NEC’s new rules that […]
Explanation of NEC Section 440 regarding air conditioning and refrigeration equipment
Hermetic motors, which are sealed units that operate immersed in refrigerant, are at the heart of air conditioning and refrigeration systems. Their specialized behavior means they cannot be treated like standard engines. That’s why NEC Section 440 exists: to supplement Section 430 and other NEC Sections with specific rules for short circuit protection, conductor sizing, […]
Explanation of NEC Section 600 regarding electrical signs and detail lighting
Electrical signs and outdoor lighting are highly visible, safety-sensitive systems with unique code requirements for conductors, grounding and equipment access. They are the focus of Section 600 of the National Electrical Code. Every commercial building needs a visual identifier, and most often, this comes in the form of an electrical sign. For this reason, NEC […]
NEC channel packing chart
The standard NEC conduit packing chart is based on Chapter 9, Table 1, and Appendix C of the National Electrical Code (NEC). It shows the maximum number of conductors allowed in different channel types at the 40% fill limit (the standard for more than two conductors). The conduit fill diagram shows the maximum number of […]
NEC Explanation Article 690 on Solar PV systems (PV)
Article 690 NEC covers installation and safety requirements for PVs (PV). It defines components such as matrices, stereotypes, marshes, and separation issues, and puts how the circles should be protected, protect, registered and their subject. The article applies to both independent and interactive systems, with or without energy storage. It does not apply to widely […]
Explanation of Article NEC 800 on communications circles
Article 800 NEC (NEC) covers Article 800 General Requirements for Communications Systems, including wire methods, grounding, fire resistance, and installation practices for cables and equipment. It applies to circuits that extend from the communications tool (such as phone or cable services) to customer buildings equipment. The article covers twisted electrical, central electrical systems, and optical […]
NEC explain Article 210 on the requirements of the sub -circuit
Article 210 NEC focuses on the basic requirements for installing branch circles, which are circuits that provide energy from the last excess current to ports and other loads. This article is an institution to understand how to distribute electricity safely in different places. The branch circle is part of the wire system that extends beyond […]
Explanation of the NEC 240 article on excess protection devices
Article 240 NEC covers the requirements for selecting and installing excess protection devices (OCPDS), such as valves and circuit breakers. The article determines the appropriate categories, position, applications, and special cases of OCPDS via applications. What is the excess current? The excess current occurs when the current exceeds the safe limit of the connector or […]
Understand the general requirements of NEC, Part 7
Article 110 provides general requirements for all installations. Section 110.12 is the famous “mechanical implementation” part of the NEC. Repeated criticism from a second. 110.12 Is it not specific enough. It begins with “electrical equipment must be installed in a professional and skillful manner.” But there is no explanation for what this means. We return […]