Answer / goutam ghosh

Busbar size for a rated current can be calculated from
CURRENT DENSITY. Current density for copper is 160
amps/sqcm.(1000 Amp/sqinch.)and for Aluminium the same is
130 Amp/sqcm.(800Amp/sqinch.).Say for 200 amps reated
current Aluminium busbar of cross section 30mm X 5mm or
Copper busbar having cross section 25mm X 5mm should be
used according to nearest availability at market.

I have a shop heater with a 1/3 hp capacitor start, induction motor driving the fan. Intermittently, the fan motor speeds up significantly for several seconds (15-60 sec) then slows to normal operating speed. The manufacturer suggested changing the capacitor which made no sense, but I did it to no avail. Could this possibly be caused by the centrifugal switch intermittently reconnecting the start winding?

1 Answers  

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which type of capacitor store high amount of energy for long time ? ( polarized or unpolarized )

1 Answers  

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how can service sitting be setted for MCCB?Example for sittings IR (CURRENT RATING),IS(CURRENT STARTING)IO (current operating

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Is it reuired to use house service barcket for 31/2 core 300 Sq.mm cable,if the distance between pole & shop is around 2 mtrs only or can I hang the cable with GI support in air? upto what size of cable GI serrvice btacket is necessary?

1 Answers   HAL,

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why neutral can not used in three phase motor connection?

1 Answers   HSL,

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I am interested to know what does 15 KVA DG set actually means? If I dont know the DG rating, is it possible to identify KW by simply knowing the diesel consumption?

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why electron flow is opposite to current flow?

3 Answers  

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How can we calculate the capacitance of generator?

1 Answers  

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What type of isolation transformer used in UPS's?? It's Star-Delata Or Delata-Star????Why it is used????

6 Answers   Emerson,

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How to check the specific gravity of the two 12 V batteries connected in series to a 24 V UPS and inverter ? will we have to disconnect all the connections and turn off the UPS and inverter or not ? will we have to check specific gravities in each cell of the two batteries ? what is the name of the instrument that is used to check the specific gravity and whats the procedure to check the specific gravity with it ? thanks

2 Answers  

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Explain the role of a car driver as one of a feedback mechanism.

0 Answers   GE,

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What is the phase relationship between the primary and secondary voltages of a transformer?

0 Answers  

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