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Electrical Riddle No.61 - Phase or positive is controlled in an electrical circuit
Why phase or positive is controlled in an electrical circuit. why not negative or neutral???....
Author : Kanagarajan - From: India
 
#1
Wed, April 9th, 2014 - 17:27
Because negative or neutral electrode usually is grounded, but neutral isolation sometimes is mandatory.

Neutral protection according to the earthing system:

The neutral must be broken by a multi-pole device:

- in TT and TN, if neutral cross-section is less than phase cross-section;
-  in terminal distribution in view of the Neutral/Phase reversal risk.

The neutral must be protected and broken:
- in IT for intervention of the protection device on the double fault, with one of the faults possibly on the neutral;
- in TT and TN-S if neutral cross-section is less than phase cross-section;
 
Author : Hamid - From: Iran
 
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