Properties of Electrical Joints between dissimilar metals

Electrical joints of Dissimilar metals – Aluminium and Copper suffer from Galvanic Corrosion and thermal expansion effects.

Useful terms -Switchgear Nameplate- IEC 60947

While commissioning Assembly, Switchgear Nameplate gives important information, characteristics, Energy, Short Circuit, Accordingly Safety can be ensured.

IEC 60947 – Low voltage switchgear and controlgear

IEC 60947 the Standard for Low Voltage Switchgear and Controlgear – ACB, MCCB, SDF, MCB, Contactor, Relay, Transfer Switch, Arc Quenching Devices.

Motor Contribution in Short Circuit Fault

Motor contribution is the Current feed back by Motor, due to rotating magnetic fied in rotor, into System during short circuit condition.

What is Electrical Insulating Materials ?

Nonconducting material that provides electric isolation of two parts at different voltages.
It must have an electrical resistivity and a dielectric strength sufficiently high for the given application.
The secondary requirements relate to thermal and mechanical properties.

IEEE 519-2014 Voltage distortion limits

For Electrical Network with non linear loads, Voltage Distortion limits are defined in IEEE 519. To ensure Quality Power Supply to Assets, Mitigate !!

What is Arc Flash ?

Arc Flash is light and heat produced as a result of Arc Fault, due to low impedance path, which causes electrical explosion or discharge.

Pollution Degree for Electrical Equipment as per IEC 60664

Pollution factor can be solid, liquid, gaseous foreign matter which may reduce the dielectric strength accordingly Pollution Degree defined IEC 60664.

What is the default arc flash boundary?

NFPA 70E establishes the default arc flash boundary at 4 feet for low voltage (< 600V) systems where the total fault exposure is less than

What is Severity Test A and B for ASSEMBLY ?

Severity Test for Assembly is defined as the Degree of impact a defect has on the operation of Assembly, under conditions of high humidity combined with cyclic changes in temperature.

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