S
stratplus
Coming across a few of these. Very small run of cable as cu is in kitchen just below bathroom but should be 10mm cable. Did the old cable used to be slightly bigger than the new stuff?
S
stratplus
Stranded, showers been in 10 yrs approx. Connector block melted at the incoming phase.
Stratplus, why do you think it should be 10mm cable? In certain conditions, small run and correct reference method 6mm will be ok for a 8.5Kw shower.
S
stratplus
Connector block in electric shower where cable joibs shwr.
S
stratplus
Worked it out to 10mm. Cable run is ok and distance but concerned about melted cable connector block.
When you say 'cable run is ok', what reference method is the cable run? Also how did you get to 10mm? 6mm clipped direct would give you 46A to play with and you need 37A (A big assumption of clipped direct though!).
If the reference method is ok then the melted connector cable block might be poor connections? Also what sort of connector block was used? What do you think the rating of the terminals are? Could be they were not suitable?
What are your thoughts as to the cause of this fault ?
Clearly because it needs a larger cable ...... Right ?
N
NickD
Well, the connector block melted cos the connector block got too warm, innit. Maybe it got warm by itself. Maybe something else made it warm. Maybe all the atoms in it just decided to have a bit of a disco and bounce around a lot to that ol' Brownian beat. It's difficult to know.
S
stratplus
Ib 37amps
In 40amps
No factors to account for
Ref method c single phase
Table 4d2a
6mm will allow 46 amps
Volt drop 2.1
So 6mm ok
I was adding .725 on factors for rewireable fuse which would make it pull 55amps so would require 10mm.
Its protected with an old style mcb with the push button and for some reason ive taken that as a rewireable fuse. These breakers push in the same as rewireables.
If you came across an undersized shwr install on a replacement shwr and a board with push button breakers which isnt rcd protected should you change the board.
Can you get rcbo's that fit this kind of board.
I know regs say that shwr installs should be rcd protected.
S
stratplus
clearly melted on the phase side, shwr casing in this area was black (white shwr). Shwr was knackered, prv operated. Took cover off to fit new prv to find melted block.
Prob a loose connection although shwr been in at least 8 yrs.
More likely a blockage on shwr outlet, causing heat in cable, which is why prv blew?? Told the shwr had been tripping b4.
Prob a loose connection although shwr been in at least 8 yrs.
More likely a blockage on shwr outlet, causing heat in cable, which is why prv blew?? Told the shwr had been tripping b4.
Sorry what's the question again ?
I'm leaning towards the idea that the missing vowels in the shwr caused increased resistance resulting in the build up of heat at the cable terminations though.
Could have been a shwrma. Now a kebab machine tapped off the same supply could have possibly caused the original fault.......
N
NickD
So the shower feed would have been the doner circuit, yeah.
J
jaypp
N
NickD
From the Wikipedia entry for the sketch:-
"At Barker's memorial service in Westminster Abbey, the cross was accompanied up the aisle by four candles instead of the usual two."
"At Barker's memorial service in Westminster Abbey, the cross was accompanied up the aisle by four candles instead of the usual two."
B
Badged01
Great minds think alike ........... althougfh listening to some, it could be argued that fools seldom differ!I concur with your wise deduction.
OFFICIAL SPONSORS
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc
Advert
Thread Information
Advert
Advert
TrueNAS JBOD Storage Server
-
-
Understanding TrueNAS JBOD Servers: A Comprehensive Guide- Started by Dan
- Replies: 8
-
