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Popular pages
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PowerTips: Motor Starting and Running Currents and Rating Guide
A word of caution : The following article is based on National Electrical Manufacturers' Association (NEMA) tables, standards and nomenclatu...
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PowerTips: Motor Starting Schemes
1. Direct-on-line Starting (DOL) This is an ideal type of starting, and is simple and economical. In this type the full voltage is applie...
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PowerTips: Thermal overload relays for Motors
A. Thermal Overload Relays The most common over current protective device is the thermal overload relay associated with motor starting c...
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PowerTips: Motor rated currents (approximate)
The following tables lists the approximate motor currents for various capacities and voltages 1. Induction Motors Rating (kW) ...
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PowerTips: Effect of voltage and frequency on motor performance characteristics
The following table summarises the effect of voltage and frequency on motor characteristics Parameters Voltage (%) 12...
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PowerTips: Selection Charts for DOL Starters (L&T Switchgear)
SELECTION CHART: FUSELESS PROTECTION FOR DOL STARTER FEEDERS WITH MPCB - Push Button TYPE '2' Co-ordination, I q = 50 kA at 415V, 30, 50 Hz...