1

I need to extend a 32Amp ring-main. Can I use Wago connectors to tap and extend the existing ring?

3

Yes, but a few points need to be observed to make sure it complies with BS7671 IET 17th Edition.

Firstly, the terminals must be installed in a Wagobox. This needs to be UK sourced to ensure you get ones that are stamped with [MF], meaning that it's classed as BS 5733 Maintenance Free box.

To comply with the IET regulations, each Wagobox is limited to 50Amps in total. The compatible terminals, 773(solid) and 222 (lever), are also derated to 20Amps.

Therefore, for a regular 32Amp ring main, you will need to use two Wagoboxes - one at the start and one at the end of the extension. As the load from any socket is shared in both directions of the ring, the derated 20Amp terminals are sufficient.

Before:

                         +---------+
     L                   |         |
    +--------------------+  |   |  +-----------+
    |                    | - - - - |           |
    |                    |         |           |
+---+---------+          +---------+           |
|             |                                |
|  Consumer   |                                |
|  Unit       |                                |
|             |                                |
|             |                                |
+---+---------+          +---------+           |
    |                    |         |           |
    +--------------------+  |   |  +-----------+
     L                   | - - - - |
                         |         |
                         +---------+

After:

                         +---------+           +-----------+
     L                   |         |           |           |
    +--------------------+  |   |  +-----------+  Wagobox  +--------+
    |                    | - - - - |           +-----------+        |
    |                    |         |                           +----+----+
+---+---------+          +---------+                           |         |
|             |                                                |  |   |  |
|  Consumer   |                                                | - - - - |
|  Unit       |                                                |         |
|             |                                                +----+----+
|             |                                                     |
+---+---------+          +---------+           +-----------+        |
    |                    |         |           |           |        |
    +--------------------+  |   |  +-----------+  Wagobox  +--------+
     L                   | - - - - |           +-----------+
                         |         |
                         +---------+
  • AIUI you only have to use the wagoboxes if the joints will not be "accessible for inspection". Otherwise any normal electrical enclosure is fine. – Peter Green Jul 19 '17 at 18:26

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