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Arc Flash Boundary – Calculated, Larger, Something Else?
It has been a while since a question of the week was asked about the Arc Flash Boundary. This is the distance from a prospective arc flash where the incident […]
Day: July 29, 2016
Non Specific incident energy
I have started working at a manufacturing plant where the past practice is to put <1.2 cal on their arc flash labels. The thought being that any run less than […]
Does your company/client(s) have photovoltaic systems?
No secret, there has been quite an increase in the use of photovoltaic (PV) systems. This week’s question is pretty simple: Does your company/client(s) have photovoltaic systems installed? Yes No […]
Photo reminder of the importance of electrical safety.
Here is a photo that is a not so subtle reminder about the importance of electrical safety. Tombstone Photo READ MORE
Improvised U.S. to International Power Adapter
Here is a photo of an improvised global receptacle adapter. Improvised International (Australia) Power Adapter Photo READ MORE
Short Circuit Calculations and Conduit Material
I recently came across a previous study that was completed for a facility that assumed a specific type of conduit [non-metallic/magnetic; PVC] vs what was actually installed [Rigid Meal Conduit], […]
Harmonic Correction Unit?
Harmonic Correction Unit? Would a Harmonic Correction Unit impact the incident energy during an arc flash in an MCC line-up? READ ANSWER
Normalized incident energy explained?
Can someone explain incident energy normalized, what is it and how it is obtained .Utilizing the Incident Energy at Working Distance -Empirically Derived Equation -NFPA 70E-D4.3, En = incident energy […]
Need some TCC curves for two fuses – can’t find them
Hi all. I have a pad mounted transformer with internal primary side 15KV rated fuses. There are two types in series. One is an expulsion fuse GE# 9F54WLD303 and one […]
Overdutied Protective Devices and Catastrophic Failures
People seem to love to watch videos of electrical explosions. One type of failure is when a protective device is applied beyond its interrupting rating and catastrophically fails (explodes) when […]
