TT system - Reg 411.5.1

[Paul505]

Just looking at the second part of this reg with the statement " The neutral point or the midpoint of the power supply system shall be earthed. If the neutral point or midpoint is not available or not accessible, a line conductor shall be earthed"
My question is... I assume they are talking about the connection at the transformer sub station and if so why did they feel the need to add this, as I haven't seen it there before now?

 

[buzzlightyear]

reg 411.5.1 it states every exposed conductive part is provided by a single PPD shall connected ,via the main earthing to the common earth terminal .

 

[Wilko]

Hi - yes that is a new sentence in the 18th. Like you, I think they must be referring to the transformer mid point being earthed at origin, as per fig 3.10, which has not changed. Sorry, I’m at a loss why they’ve added it too.

 

[Strima]

Added to add confusion.

 

[static zap]

Added to add confusion.

Neutral is a "Line" conductor... but have you got one!
(Looking at Buzz'es Diagram)

 

[davesparks]

My question is... I assume they are talking about the connection at the transformer sub station and if so why did they feel the need to add this, as I haven't seen it there before now?

It has probably come as a result of international harmonisation,

 

[Charlie_]

Neutral is a "Line" conductor... but have you got one!
(Looking at Buzz'es Diagram)

No it isn’t

 

[Charlie_]

The regs have made another typo

 

[static zap]

No it isn’t

Does it need a name then like "star-point"... ?
Or is that half the battle in a world of Non-verbal Icons.

 

[Charlie_]

Sorry, I meant neutral isn’t a line conductor

 

[Deleted member 26818]

Just looking at the second part of this reg with the statement " The neutral point or the midpoint of the power supply system shall be earthed. If the neutral point or midpoint is not available or not accessible, a line conductor shall be earthed"
My question is... I assume they are talking about the connection at the transformer sub station and if so why did they feel the need to add this, as I haven't seen it there before now?

This relates to portable generators.

 

[buzzlightyear]

I do you know why the a88 holes write the books and put the appendix at the back of the books is beyond me. when you are looking for things ,they has well right it in Chinese. or Arabic .

 

[Strima]

I do you know why the a88 holes write the books and put the appendix at the back of the books is beyond me. when you are looking for things ,they has well right it in Chinese. or Arabic .

It's like trying to read one of your posts Buzz...

 

[buzzlightyear]

It's like trying to read one of your posts Buzz.

sticks and stones will break me bones ,but the words will never hurt me .

 

[davesparks]

This relates to portable generators.

TT isn't used with portable generators.