Power System
-
When and Why Did the U.S. Transition from 110V to 120V Supply?
Why Did the Voltage Level Increased from 110V to 120V in North America? Electric power transmission and distribution is not as straightforward in the U.S. as it is in IEC-following…
Read More » -
Why Did Japan Choose 100V over 120V or 230V?
Why Does Japan Use 100V as the Standard Voltage? Power System in Japan Japan has a unique and somewhat unusual electric power transmission and distribution system. The standard voltage in…
Read More » -
Why Japan Uses Overhead Power Lines Instead of Underground?
Why Do Tokyo’s Streets Have Overhead Power Lines Instead of Underground Cables? The travelers may noticed that the streets of Tokyo, and much of Japan, filled with unsightly overhead power…
Read More » -
Why are Capacitors Connected in Series in Power Lines?
Why are Capacitors Connected in Series with Power Transmission Lines? While capacitors are often associated with shunt applications for power factor correction, series capacitors are widely used in transmission lines…
Read More » -
Why is a Capacitor Bank Connected in Parallel and Not in Series for P.F?
Why is a Capacitor Bank Connected in Parallel and Not in Series for Power Factor Correction? Capacitor banks are used to improve power factor and voltage regulation in electrical systems.…
Read More » -
Why Does Japan Use Both 50Hz and 60Hz in Its Power System?
Why and How Does Japan Use Both 50Hz and 60Hz Frequency in its Electrical Power Systems? Japan uses both 50Hz and 60Hz power frequencies due to historical and logistical reasons…
Read More » -
Why is the Neutral Wire Size Smaller than the Phase Wire?
Why is the Size of the Neutral Conductor Smaller than the Line Conductor in a Polyphase System? In a three-phase (poly-phase) system, the Neutral wire may sometimes be smaller than…
Read More » -
Why is the Ground Wire Size Smaller than the Hot Wire?
Why is the Size of the Ground Conductor Smaller than the Line Conductor? The ground wire does not always have to be the same size as the power (phase or…
Read More » -
Why Must Neutral and Ground Wires Be Bonded in the Main Panel?
Why Do Neutral and Ground Conductors Need to Be Bonded in the Main Panel? According to NEC Article 250, both the neutral and ground wires must be connected only in…
Read More » -
Why are Neutral and Ground Wires Separated in a Subpanel?
Why Do Neutral and Ground Conductors Need to Be Separated in a Subpanel? According to NEC Article 250, neutral and ground wires must remain separate in subpanels. Bonding (connecting) the…
Read More »
