Q. A single main breaker is installed, then taps supply individual meters with disconnecting means for individual tenants. Should a main bonding jumper be installed at the single main breaker or at each separate disconnect?
Q. When a conduit leaves a Class I, Division 1 classified paint spray room and goes under the concrete floor into a cabinet in the motor control room that is non-classified, is one sealing fitting in the paint mix room sufficient, or is an additional sealing fitting required in the non-classified area as well?
310.15 Conductor Ampacity (A) General Requirements The ampacity of a conductor can be determined either by using the tables in accordance with 310.15(b), or under engineering supervision as provided in 310.15(C). FPN No. 1: Ampacities provided by this ...
Q. A conductor passing through a box unbroken counts as one conductor, so if I loop a conductor through the box unbroken and strip off enough insulation to terminate on a receptacle without cutting the wire, does the conductor count as one or two conductors for box sizing?
This paper presents the case for discussion on the advantages and disadvantages of each method for generator grounding. Medium Voltage Generators are not designed to withstand full fault current during a single phase to ground fault. This is the main reason that medium voltage generators are connected to a system with either low or high impedances. There are many methods to ground generators. To find out what these methods are, please download this free whitepaper....More
The decision on which grounding system one should employ has a direct and quantifiable impact on electrical safety and reliability. This whitepaper identifies why High Resistance Grounding is the superior choice as it provides process continuity even under a single fault condition,...More
Thermal imaging is a proven technology that has enhanced the troubleshooting abilities of electrical and construction professionals. With the incredible advancements in technology and at very affordable prices......More
Considering the devastating impact of ground faults and the arc flash hazard, electrical safety is an essential priority for every business. Electrical reliability and safety starts with the decision on which grounding system to employ....More
Learn what you need to know through this lively presentation with NEC expert Mike Holt. Ground fault circuit interrupters (GFCIs) are designed to disconnect power to a branch circuit whenever the unit detects an imbalance of current between the energized conductor and the neutral conductor. Since the 1970s, GFCIs have saved thousands of lives and helped cut the number of home electrocutions in half. In recent years, the NEC has expanded the requirements for these devices to many other areas outside the home....More
Our new TVB810 TV Box™ delivers the ultimate in versatility for installing wall-mounted TVs in retrofit projects. There's more room in the box for wires; plus, you can install it horizontally or vertically to ensure proper positioning of low voltage connections behind the TV....More
Arlington’s new non-metallic adjustable mounting brackets are perfect for low voltage installations when the final wall thickness is unknown. Set for a 1/2" thick wall finish, they adjust to accommodate a finished wall up to 1-1/2" thick. Support tabs deliver extra-secure mounting of bracket to wood or steel studs in new constructions....More