Electrical Engineering Guides
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1910.147 vs 1910.333: Which OSHA LOTO Rule Applies to Electrical Work?
For U.S. general-industry work, the answer starts with the hazard and the task, not the padlock. OSHA’s 29 CFR 1910.147 covers control of hazardous energy during servicing and…
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Load Factor Formula: Calculate It From kWh, Peak kW and Hours
Load factor compares average electricity demand with the highest demand in the same period. The U.S. Energy Information Administration defines it as the ratio of average load to…
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Induction Motor Slip Calculation: Formula, RPM Table and Worked Example
Induction motor slip is the rotor’s shortfall behind the rotating magnetic field. First calculate the field’s synchronous speed in revolutions per minute (rpm): Ns = 120 x f…
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IEEE 519 at the PCC: THD, TDD and Where Harmonic Limits Apply
IEEE 519 harmonic control is a point-of-common-coupling (PCC) question before it is a percentage question. The official IEEE SA catalog says the active 2022 standard establishes steady-state waveform-distortion…
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IE2, IE3 and IE4 Motor Efficiency: IE Codes vs EU Requirements
IE2, IE3 and IE4 are International Energy efficiency classes for motor efficiency; they are not, by themselves, a legal approval. In the European Union, Regulation (EU) 2019/1781 sets…
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kW vs kWh: How to Calculate Electricity Use
A kilowatt (kW) measures power: the rate at which equipment uses or supplies energy. A kilowatt-hour (kWh) measures an amount of energy. To calculate electricity use at a…
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How Pumped Storage Hydropower Works: Charging, Generation and Losses
Pumped storage hydropower stores energy by moving water uphill. It uses electricity to pump water into an upper reservoir, then generates electricity when water flows back down through…
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Transmission vs Distribution: How Electricity Reaches Your Building
Transmission carries bulk electricity between generation and major network nodes. Distribution delivers it through local networks to customers. Voltage is an important clue, but network function and the…
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Capacity Factor vs Efficiency: What Each Number Really Measures
Capacity factor measures how much electricity a generator produced compared with continuous operation at a specified capacity over the same period. Efficiency measures how much input energy becomes…
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Battery Storage MW vs MWh: Calculate Duration Without Mixing Ratings
For battery energy storage, MW describes output power and MWh describes energy capacity. Their ratio gives duration in hours when both ratings use a compatible basis: Duration (h)…