dennis@home wrote:

On 21/03/2019 16:12, wrote:
On Thursday, 21 March 2019 12:53:00 UTC, dennis@home wrote:
On 20/03/2019 19:39, ARW wrote:
On 20/03/2019 18:11, Scott wrote:

I discovered a problem with a join in a ring main and decided to
replace the faulty connector with a terminal block. I wondered if
this needs to be rated at 30A to correspond with the fuse (RCBO) or if
15A would be okay on the basis that it is a ring and some of the
current will go each way round.

On the Brunel principle I am fitting 30A but I am curious to know.


https://www.youtube.com/watch?v=2uYD8e7idnY


The video shows that the connectors will carry the current when new.
But what happens after they have had a few thermal cycles?
I would think the wire nut and the choc block will fail first.

Choc block & crimp are gas-tight, so should last. Wago might be gas
tight if the wire is never moved, it certainly won't be if any movement
occurs. Wirenuts aren't gas tight. US electrical fires are a testament
to that.


NT


choc block are not gas tight.

Agree. No threaded connector is secure without an *adequate* locking
mechanism or sealant. If you look at WW2 electronic stuff, any
terminals are lacquered. May not be adequate, but at least they tried.
Wagos are supposed to be used with cables retained or clipped down (and
in the latter case the box they are in must also be fixed).

--

Roger Hayter