1-Phase Circuits

Single Phase AC Circuits

Why 3-Phase Power? Why Not 6, 12 or More for Power Transmission?

Why is Only 3-Phase Power Supply System Used Instead of 2-Φ, 4-Φ, 6-Φ, 12-Φ or More Number of Phases for Power Transmission & Distribution? We know that the most common…
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If a 1-Phase Supply is 230V, Why is 3-Phase 400V & Not 690V?

When Single Phase Supply Voltage is 220V, Why is Three Phase 440V and Not 660V? If there are three winding coils on the rotor of an alternator winded 120° degree…
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How to Determine the Right Size Capacity of a Subpanel?

Sizing the Suitable Capacity of a Subpanel or Main Lug A subpanel or main lug (aka Remote Panel in NEC) is a smaller service panel installed downstream from the main…
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How to Determine the Number of Circuit Breakers in a Panel Board?

How to Calculate the Number of Circuit Breakers for a Home Load Center and Distribution Board Based on the Load Calculation? In the USA and Canada, the common supply voltage…
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How to Size a Load Center, Panelboards and Distribution Board?

Sizing Load Center, Panelboards, Distribution Board & Consumer Unit According to NEC and IEC? Planning is the first and key priority for all electrical wiring projects and a proper estimation…
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Voltage Divider Rule (VDR) – Solved Examples for R, L and C Circuits

Voltage Division “VDR” for for Resistive, Inductive and Capacitive Circuits What is Voltage Divider Rule? In a circuit, when a number of elements are connected in series, input voltage divides…
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Current Divider Rule (CDR) – Solved Examples for AC and DC Circuits

Current Division “CDR” for for Resistive, Inductive and Capacitive Circuits What is Current Divider Rule (CDR)? When a number of elements are connected in parallel, the current divides into a…
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Millman’s Theorem – Analyzing AC & DC Circuits – Examples

Millman’s Theorem for AC & DC Circuits – Step by Step Solved Examples Millman’s Theorem The Millman’s theorem is used in the circuit analysis when it has only branches in…
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How to Wire a Subpanel? Main Lug Installation for 120V/240V

Wiring a Subpanel for 120V & 240V with GFCI – NEC – US What is a Main Panel? According to NEC (National Electric Code: Article 1 00-Definitions), a Main Panel…
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How to Wire a Twin 3-Pin Socket Outlet? Wiring 2-Gang Socket

How to Connect a 2-Gang, 3-Pin BS1363 Socket Outlet? Wiring Switched Double Plug Socket 3-Pin Dual Socket Outlet A BS1363 socket outlet (by IEC) is also known as a UK…
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