Neutral - Earth link in Main Switchboard

[charzree]

When is an earth neutral link required in an main switchboard? Is it particular to the earthing system?

Is it common to earth the source neutral at the first point in the LV system where the neutral is terminated - the main LV switchboard.

If the Neutral terminal of the transformer is grounded near the transformer and if it is interconnected with the other earth rods/bars? Is still neural - earth link to be provided at the Main switchboard?

 

[dmxtothemax]

Is it common to earth the source neutral at the first point in the LV system where the neutral is terminated - the main LV switchboard.

If the Neutral terminal of the transformer is grounded near the transformer and if it is interconnected with the other earth rods/bars? Is still neural - earth link to be provided at the Main switchboard?

1 - Yes it is common, most have it, but some may not.
2 - Yes it is still neutral. it is simply using earth as a means to get home.

 

[Carl S]

If REF (Restricted Earth Fault) monitoring is being used the N→E link will be in the main switchboard. Otherwise the link can be at the transformer or the switchboard, it’s up to the designer.