Answer / arup

ZONE 0 --Areas in which an explosive gases atmosphere (An
explosive gas air mixture) is present continuously or
present for long time.
ZONE 1---An area in which explosives gas atmosphere is
likely to occur in normal operation.
ZONE 2--An area in which an explosive gas atmosphere is not
likely to occur in normal operation and if it does occur,
it will exist for a short period only.

What is the difference between relays and contactor construction wise?

0 Answers  

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why single core HT cable need only one side earthing?

2 Answers  

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In a 3 phase 4-wire system. For a 3.5 core cable if all loads are single phase and balanced, what will be neutral current? will it be sum of all phase currents? Or it will be zero? And if loads are unbalanced what will be neutral current?

0 Answers  

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How to calculate no of EARTH PIT? Describe the formula as per IS standard?

0 Answers  

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defined power system?

3 Answers   Spanco,

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1. What kVA rating is required for a transformer that must handle a maximum load current of 8 A with a secondary voltage of 2 kV?

3 Answers   BCPL,

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What is the formula to find out cross sectional area of cable for certain current rating?

1 Answers   MRF,

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Is there any specialised book to refer about fault level calculation both in MV and LV side??

0 Answers  

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What is ignitor and why it is use in Hpmv lamp ?

2 Answers  

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How to design CT for connected with Transformer OLTC operation? normally CT output design for 1A/5A range but during OLTC Tap position changing time how to function the CT?

1 Answers   HEG,

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for 644KW load which MCCB should i use

6 Answers  

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In Single Phase AC Supply,If Voltage between Phase and Neutral is 230V means what will be the Voltage between Phase and Earth?

2 Answers  

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