What is a motor control center (MCC)?
Hundreds are electrical motors are used in modern-day industries for process automation and control. To control those motors, motor control centers or MCC panels are needed. They contain circuit breakers…
Methods of Ground/ Earth resistance measurements on existing systems
It is vital to maintain good ground in a system. In order to ensure that, ground resistance measurements and tests are conducted on existing earth electrodes at periodic intervals after…
Fall of potential method or 3-point method for Earth resistance measurements
The fall of potential method or 3-point method is the most commonly used method to measure ground resistance. It is used to determine the earth resistance of an existing grounding…
Soil resistivity measurement methods
One of the key elements affecting ground resistance is soil resistivity. Soil resistivity measurements are conducted before setting up an earthing system, in order to ensure an effective earthing. Good…
Power consumption and energy usage of humidifiers
Humidifiers are used to increase the humidity in a confined space. They can be used to humidify living rooms and ventilators can be used to treat dryness. A typical household…
Power consumption and energy usage of exhaust fans
A typical household exhaust fan consumes 40 watts of power. The energy usage of an exhaust fan purely depends on how many hours it spins. The energy usage of exhaust…
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…