Calculating Flash Protection Boundary Distances
In NFPA 70E, the short-circuit symmetrical ampacity from a bolted 3-phase fault at the transformer terminals is calculated with the following formula: where Isc = Amperes, V = Volts, %Z …
Electrical Burns
Electricity is both our friend and enemy. It is our friend if we are aware of its dangers and know how to handle it properly. When working with electricity, safety …
Counterfeits Can Kill
Every day, counterfeit electrical products are finding their way into our homes, businesses, and public institutions. These fraudulent products pose a serious financial and legal liability to the electrical industry, …
Arc-Flash Hazards
An arc-flash is a release of energy caused by a flow of fault current through an electrical arc plasma. Arc flashes can occur when racking a breaker in/out, removing a …
Insulation Coordination – Why is it required?
What is insulation coordination and what is its importance? There are many definitions of insulation coordination provided by different authorities. In this instance we wanted to use IEC 60071-1 definition …
Compliance to NEC Standards and Requirements is not Compliance to NFPA 70E
Some employers assume that compliance to the standards and requirements of the National Electrical Code is as good as compliance to the NFPA 70E since both published by NFPA. It …