1)How much current can a 3-1/2 core 100 mm wire carry? 2)What are the special c

1)How much current can a 3-1/2 core 100 mm wire carry?
2)What are the special cables required for explosion proof wiring?
3)In case you do not have coal and salt for earthing, how can you achieve good temporary earthing?
4)One horse power single phase motor is more likely to get hot than a one horse power 3 phase motor. Is it true or false, if true why?
5)What are the different types of soft starters for large motors?please explain?

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