Available Fault Current – JADE Learning

Your Boiler’s Summer Vacation: Not All Fun and Games

Summer is the perfect time to inspect your boiler and ensure it works properly during the winter months. Here are some fireside and waterside inspection tips!

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NEC Section 210.11(C)(4) | Required Branch Circuits in a Dwelling Unit Garage

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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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Your Boiler’s Summer Vacation: Not All Fun and Games

Most Recent

NEC Section 210.11(C)(4) | Required Branch Circuits in a Dwelling Unit Garage

The Value of the Security Assessment

2020 NEC Article 605 | Office Furnishings

Cold Climate Heat Pumps

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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