2020 National Electrical Code
2020 NEC, Section 300.25: Wiring Located in Exit Enclosures
NEC Code section 300.25, General Requirements for Wiring Methods and Materials is new for the 2020 Code cycle. This section regulates wiring located in Vertical Exit Enclosures, also known as stair towers. The new 2020 NEC section restricts the installation of any wiring method within an exit enclosure separated from the building by fire-resistant construction, except for that wiring belonging to equipment in the exit enclosure. Prevent costly design and installation errors—read more from our blog!
NEC 70, Article 250, Section 250.121(B), Metal Frame of Building or Structure
Article 250 is arguably the most important article in NEC 70, and much of its content is devoted to the proper sizing and installation of equipment grounding conductors. First, let us consider the purpose of an equipment grounding conductor (EGC). We know that EGC’s provide a low impedance path from the equipment to the overcurrent protective device (or ground detector for high-impedance grounded systems) so that a fault condition can be quickly cleared. Hence, EGC’s are a critically important safeguard to persons and equipment.
Electrical Job Site Management in Four Easy Steps
By the time the company makes it to the job site, considerable time and money have already been spent on the project. The electrical foreman has many responsibilities and can single–handedly be the cause of a failed project. The foreman needs to be the National Electrical Code guru, assistant to the Project Manager, Human Resources liaison, team coach, and much more. Like other positions in the field, the electrical foreman needs continuous training to keep on top of the game. Here are four easy steps for managing an electrical job site.
2020 National Electrical Code: Article 330 Metal-Clad Cable Type MC
Metal-Clad (MC) Cable is used every day in the electrical industry. The true conduit benders hate it. The value engineering people love it. MC Cable is really a great product, has a wide variety of uses, and can be installed to look good. Let’s take a closer look at this industry workhorse: Metal-Clad Cable.
MC Cable Definition
MC Cable, by most common definition, is a factory assembly of one or more insulated circuit conductors enclosed in an armor of interlocking metal tape or a smooth or corrugated metal sheath. The smaller cables should be unsheathed by using an armored cutter like the famous “Roto-Split”. The fittings must be listed and identified for use. If the manufacturer provides anti-short bushings, they can be used. The bushings are not an NEC requirement since the listed MC connectors provide the conductor protection from sharp edges.