Available Fault Current – JADE Learning

The National Electrical Code

The first electrical codes were written in the late 1800’s by various associations, including the New York Board of Fire Underwriters and the National Board of Fire Underwriters. Eventually, the National Fire Protection Agency was established and National Electrical Code was born. Have you ever thought about who writes the […]

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Iowa Electrical Continuing Education Virtual Instructor-Led Training (VILT)

Get 4 hours of electrical continuing education for Iowa – Join us from the comfort of your own home for a continuing education webinar covering 2020 NEC Changes.

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Mitigating Flooding Impacts on Drinking Water Treatment Systems

We’ve talked in the past about how drought conditions can negatively impact drinking water systems. However, to the inverse, there are also problems and challenges caused by an overabundance of water flooding a system. This article will reveal how flooding can negatively impact drinking water treatment systems. It will also […]

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Basic Surface Water Treatment

Surface water treatment is used to prepare water collected from streams and lakes for human and industrial consumption. The chief mission is to protect human health, eliminating harmful organisms and chemicals before the product is distributed. The facilities used have had different names over a couple of centuries and some […]

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Following the Footpath to Next Generation 911 Communications

“911, do you need Police, Fire, or Medic? Please hold.” Then, “where are you calling from?” These are words that no one wants to hear in the middle of an emergency. Anyone who has had to call 911 wants immediate service with emergency services onsite right then. When most people […]

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Short-Circuit Current-Rating (SCCR) VS. Available Fault Current: Understanding the Maze and What’s New for 2020

Section 408.6: A Brand-New Addition to the 2020 NEC
NEC section 408.6 states: Switchboards, Switchgear, and Panelboards shall have a short-circuit current rating (SCCR) not less than the available fault current.  In other than one- and two-family dwelling units, the available fault current and the date the calculation was performed shall be field marked on the enclosure at the point of supply. The marking shall comply with 110.21(B)(3).

Making NEC 408.6 Simple
This new Code Section simply means that electrical panels including main-breaker and main-lug type panels and switchboards & switchgear equipment must be rated (in amps) to withstand the high levels of current that will flow should a short-to-ground or other fault occur at the equipment. In ALL locations other than dwelling units, that anticipated fault current must be marked on the equipment enclosure near where the supply conductors enter in, along with the date that the calculation producing that number was performed. The new Code Section also says the markings on the equipment must comply with 110.21(B)(3). Section 110.21(B)(3) tells us that markings must be sufficiently durable to withstand the environment.

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Selecting the Short Circuit Current Rating of Equipment

In the Summer Newsletter article, we discussed marking our service equipment with the maximum Available Fault Current (AFC) as well as the date the fault current calculation was performed to comply with NEC 110.24(A). We selected circuit breakers with an AIC rating equal to or greater than the AFC. So […]

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The National Electrical Code

Most Recent

Iowa Electrical Continuing Education Virtual Instructor-Led Training (VILT)

Mitigating Flooding Impacts on Drinking Water Treatment Systems

Basic Surface Water Treatment

Following the Footpath to Next Generation 911 Communications

Recently in

Short-Circuit Current-Rating (SCCR) VS. Available Fault Current: Understanding the Maze and What’s New for 2020

Selecting the Short Circuit Current Rating of Equipment

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