Grounding transformer or Earthing transformer
Grounding transformers are used to obtain a neutral when an existing delta-connected or ungrounded systems are to be grounded. These transformers provide a path for the flow of fault currents…
Dual-element time-delay fuses
Time-delay fuses can provide overload and short circuit protection while overcoming momentary current spikes. They are used for the protection of motors and transformers. The time-delay characteristics of these fuses…
Interview questions on Modbus
Below is the list of the most important interview questions on Modbus: 1. What is Modbus and how does it work? Modbus is an application layer-level communication protocol that defines…
Difference between AC contactors and DC contactors
The AC contactors differ from the DC contactors in their construction, arc extinction, and usage in a circuit. In this article, let us discuss the major differences between AC contactors…
Resonant grounded system (Ground-Fault Neutralizer)
A resonant grounded system can significantly reduce the ground fault currents. This grounding system basically consists of a tuned reactor connected between the neutral and the ground that resonates with…
Reactance grounded system or inductance grounded system
In a reactance grounded system, the neutral is connected to the ground through an inductance (inductive reactance). The magnitude of the ground fault current can be limited to a value…
Ingress protection rating or IP rating (IEC 60529)
IEC 60529 has classified the degree of protection offered by an enclosure against solid particles and liquid. This classification is known as the ingress protection code/ IP code/ IP rating/…
Types of Electrical Earthing as per IEC 60364 & BS 7430
Effective electrical earthing plays an important role in safeguarding people from the risk of electric shock and ensures a low impedance path for electric discharges to pass to the general…
Are earthing and grounding the same?
Ground and/or Earth are generally used to define a common reference point for power/signal. While IEC (IEV ref 195-01-01) defines this reference point as earth, IEEE (Standard Std 142-2007) defines…