why -48 volts dc used in telecommucation

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Cummins 750 KVA generator how much disel consumed per hour and how many units generated on 100% full load.

1 Answers  

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In Panels Main Incomer considered should be TPN or FP?

2 Answers  

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WHAT IS METHOD TO DESIGN SIZE OF A 11KV UNDER GROUND CABLE FOR A OUTGOING FEEDER FEEDING 6NOS 250KVA TRANSFORMERS WITH 5KM LENGTH OF FEEDER?

1 Answers  

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What type of pipe material G.I or M.S is used for sprinkler system?

2 Answers  

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I am having dual speed motor of cromton greaves make of 3.7 KW -1400 rpm and 5 KW - 900 rpm. Please let me know groups and winding connction for rewinding purpose.

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In a HT switchboard where Nos. of Transformers are connected, how to decide Incoming cable size? Whether Cable should be rated for connected load or maximum demand?

1 Answers   Power Grid,

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In our plant we have installed new MCC with ELR and CBCT which is detecting some leakage current in the system but it leading to some confusion when to check that in which feeder which is drawing current we put off the whole panel itself but still CBCT detecting some leakage current so can anybody ans me , where i am going wrong or how to detect whether its actual leakage or CBCT malfunctioning.

0 Answers   Saint Gobain,

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what is the static device rather than xmer which work on same principle as xmer?

18 Answers   NTPC, Power Grid,

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I have a relay contact rated at 220v dc which is supplied with a 24vdc from the panel,for it to trip the dampers(24vdc).What if the application of the relay changes so that it should work at its rated 220vdc then will it work at 24vdc supply given or any other consideration needs to be taken .....

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where solid grounding and where grounding through ngr done and why?

0 Answers   NTPC,

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if acapacitor connected to power supply will it cosume power& will it going to get recorded in energy meter

2 Answers  

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