How do you select a cable size(Cu&Al) for a particular load
Answer Posted / muralidhara kumar
Generally for copper cable sq.mm2 *2.5
for alluminum cable sq.mm2 *1.5
Is This Answer Correct ? | 6 Yes | 7 No |
Post New Answer View All Answers
What are the conditions for sustained oscillator or what is backhouse criterion?
what is difference between 9kv 5ka surge arrester and 9kv 10ka surge arrester.
What is making & breaking current ???
Which type of air compressor is used now a days in the market. Keeping in mind of energy efficiency and maintenance points. Relevant documents may also be sent on mentioned email ids.
why we change the direction of winding in rotor ?how we make the north and south pole?
What about electrical Units. discrive in detail
Difference between a pilot wire and a normal conductor?
what is the formula of starting current of 3phase and 1 phase motor???
Why are iron cores in transformers made laminated?
Anybody know how schematic diagram for reverse power relay? RPR for generator protection
DEAR SIR,I GOT THE CALL LETTER FROM RRB, SECUNDERABD AS A JE-II SO PLEASE PROVIDE ME SOME MODEL QUESTION AND ANSWER PAPERS AND LAST YEAR QUESTION PAPERS
What is difference between insulating medium and fault current interruption medium in a switching device.
Difference between Lugs and Thimbles
1. What is differential relay? How it operates? 2.How to calculate the Short Circuit Impedance in Transformer? 3.What is the alternate solution for testing of polarity by using polarity tester while its milli ammeter does not works? 4. While testing the 33KV Busbar by using Hipot kit, what should be the test voltage we have to apply? 5. What is the procedure/activities to be taken to inject the current more than 2000A by using 2000A Loading Transformer? 6. Explain how you can give the overload setting to any Motor Protection Relay for a HT motors with formula and example? 7. Why restricted earth fault protection is needed? Why can’t differential Protection is sufficient? 8. What should be the minimum and maximum ohmic value for earthing? 9. Why DC Currents are not used in transformer? 10. What is the Frequency while we step up the voltage from 220V to 11KV? Is it possible? Explain it?
What are the commonly used schemes for the bus zone protection?