Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 21 replies
  • Subscribers 32 subscribers
  • Views 3353 views
  • Users 0 members are here
Options
You may also be interested in
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

421.1.201.

Zoomup
Mornin' All,

                      is there available an insulated enclosure, non conducting, suitable for a double pole D.I.N. rail mounted R.C.D. that complies with 421.1.201 please.


Z.
Parents
  • 0

    Chris Pearson:




    Farmboy:




    Zoomup:

    Thanks all. I was just checking to see if anything had changed after the long discussions about this subject in the past. I intend to place a 100mA S type R.C.D. before a new metal cased consumer unit on a TT earthed installation.




    Could the S type not go in the CU as per section 2.2.6 of the OSG?



    Yes, that seems to be the common way, but if an isolator is going to be installed in a (domestic) TT installation, then why would you not use an RCD "main switch" instead of an ordinary one in your REC2 (or similar) enclosure? The you can stop worrying about your tails flapping about or getting chaffed - as if that could happen when competently installed!


     




    Reasons why the L could flap about and touch the metal consumer unit enclosure these days.


    1. Tails are like spring steel due to hard copper, that could cause  stresses that may move the tail from its terminated position to a dangerous one. 


    2. Modern terminals are p.p. and do not reliably grip the tails in my opinion. They are only a single screw device with shallow grip on the conductor.


    3. Breakdown of the main switch due to poor quality or lightning damage.


    4. X. The unknown as yet fault that causes the L tail to liven up the consumer unit enclosure and everything else.


    Z.

Reply
  • 0

    Chris Pearson:




    Farmboy:




    Zoomup:

    Thanks all. I was just checking to see if anything had changed after the long discussions about this subject in the past. I intend to place a 100mA S type R.C.D. before a new metal cased consumer unit on a TT earthed installation.




    Could the S type not go in the CU as per section 2.2.6 of the OSG?



    Yes, that seems to be the common way, but if an isolator is going to be installed in a (domestic) TT installation, then why would you not use an RCD "main switch" instead of an ordinary one in your REC2 (or similar) enclosure? The you can stop worrying about your tails flapping about or getting chaffed - as if that could happen when competently installed!


     




    Reasons why the L could flap about and touch the metal consumer unit enclosure these days.


    1. Tails are like spring steel due to hard copper, that could cause  stresses that may move the tail from its terminated position to a dangerous one. 


    2. Modern terminals are p.p. and do not reliably grip the tails in my opinion. They are only a single screw device with shallow grip on the conductor.


    3. Breakdown of the main switch due to poor quality or lightning damage.


    4. X. The unknown as yet fault that causes the L tail to liven up the consumer unit enclosure and everything else.


    Z.

Children
No Data

Community Rules & Guidelines