HOW TO CONNECT DC POWER SUPPLIES IN SERIES, PARALLEL AND REDUNDANT CONFIGURATION?
DC power supplies may be connected in series, parallel or redundant configuration depending on the application need. When higher voltage…
Difference Between ELV, SELV, PELV and FELV
ELV stands for Extra Low Voltage and is indicative of systems operating under 50VAC or 120VDC (ripple free). ELV systems…
What happens when Phase and Neutral are reversed ?
There are some regions of the world such as North America, where polarized receptacles are used, while other parts of…
Telephone Interference Factor
Harmonic voltage and current present in power system can negatively affect the quality of reception of telephone and other communication…
Capacitor bank discharge methods
Capacitor bank can hold dangerous voltage after disconnecting from power system unless discharging devices are connected to the capacitor terminals.…
What is the electrical resistance of human body?
Electrical resistance of human body has been estimated to be 1,000 Ω according to IEEE Std. 80 standard. Resistance is…
STRAY VOLTAGE – HOW DOES IT ORIGINATE?
Stray voltage is defined by IEEE as “A voltage resulting from the normal delivery and/or use of electricity (usually smaller than…
POWER QUALITY CHECK USING MULTIMETER
This article discusses methods to measure basic power (Voltage) quality parameters using a multimeter. Using any advanced digital multimeter (similar…
Rogowski Coil Flexible Current Transformer
Flexible current transformer is also known as Rogowski coil. What is a Rogowski Coil? Rogowski coil is an electric current…
Isolated Ground Receptacle
When interference from electromagnetic sources needs to be managed on the ground circuit of a particular load or sensitive electronic…
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