Answer Posted / b.sudhahar bagavathiappan

I have think 1 ton = 1.2 kw, HVAC design pepoles are using
that value for constrction works

DG Earth Value?

1869

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State the points to be considered for selecting a particular type wiring.

1635

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What is the maximum operating temperature for a thermoplastic insulated cable?

658

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What are the parts in a inverter?

1573

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On what basis the the size of Lightning arrester for buildings are selected ?

1109

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what is meaning of bus riser

1955

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My question is whether bellow formula is correct to find bus size for 46kA for 0.5 second & what is RT in bellow formula. formula to calculate the size of busbar to withstand the thermal stresses due to currents with duration of 0.2 sec to 5 sec. Sp = RT( I x I x t) / K Where Sp – is the cross sectional area of bus bar in millimeters. I -    is the value of AC fault current. t -    is the operating time of disconnecting device in seconds. K –  is the factor depending on the material of the conductor, insulation and initial and final temperature. Value of ‘k’ for copper is 143.

1452

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why transmission is only 3 phase and not 2 or 4 or poly phases

1709

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what is settable hystersis protection? If any body knows plz kindly post the answer..

1559

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How Can I calculate for the photometrics requirements for a street lighting? Data given are: 45 units of 6 meter light pole with 150 watts metal halide lamp, 220 volts and installed in a promenade area.

1426

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How cable from Kit-Kat to main switch, from starter to motor are designed?

1584

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is it possible to say motor horsepower number without seeing name plate(when name plate damaged)

4150

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What are the classifications of oscillators?

684

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State uses of different types of stsrters with different capacities of motors as below: a. up to 5HP b. above 5hp to 10hp c. above 10hp to 20hp d. above 20hp

1477

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What is the different types of cable & current capacity of cable

1446

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