TT System 100ma S Type Housing

[Des 56]

To say it would not have complied at the time is not correct, both 16th and 17th Editions state an rcd (incorporating overcurrent protection) or an overcurrent protective device may be used for fault protection. Both state the rcd is the "preferred" option.

Quote
Most all TT systems have always required a Rcd for earth fault protection


Well,the reason I used the term "most" at the start of the reply was precisely because of the reason you state
But I agree if anyone was to state "it would not have complied" I too may have posted a similar response as yours

 

[westward10]

Quote
Most all TT systems have always required a Rcd for earth fault protection


Well,the reason I used the term "most" at the start of the reply was precisely because of the reason you state
But I agree if anyone was to state "it would not have complied" I too may have posted a similar response as yours

What are "most TT systems" are there different types.

 

[Des 56]

What are "most TT systems" are there different types.

Most TT systems is used as a numerical term to portray the overwhelming number of TT sytems that need Rcd protection (when compared to those that can rely on the Mcbs only) and you know "exactly" what was meant by myself

Why are you pushing for conflict of opinion,you and I know exactly what is required
Nothing I posted has sought to cause mischief with yourself or anyone else

 

[westward10]

Sorry Des no conflict intended

 

[Deleted member 26818]

Not aware that either the 16th or 17th edition mention "incorporating overcurrent protection" in relation to RCDs?
My understanding, is that an RCD incorporating overcurrent protection is an RCBO.

 

[westward10]

Not aware that either the 16th or 17th edition mention "incorporating overcurrent protection" in relation to RCDs?
My understanding, is that an RCD incorporating overcurrent protection is an RCBO.

I slightly reworded Reg 411.5.1 to save it being "wordy".
Note 2 of said reg says where an rcd is used for fault protection the circuit should also incorporate an overcurrent protective device. So this could be an rcbo or mcb and separate rcd.

 

[saspm]

I have called the Niceic help line today as to weather a 100mA S Type RCD is required on the TT system and can confirm that:

In my case:

If the 16th edition board is converted to a 17th board using the original plastic casing it will not require a 100ma time delayed RCD, as long as the meter tails are short enough. This also applies to the new metal consumer unit.

Thanks for everyone's input