Cu upgrade or not ?

[trev]

Mike, this isn't readers wives

 

[Guest77]

Mike, this isn't readers wives

Sorry Trev, I got my days mixed up and thought it was Friday, Apologies lol

 

[jaypp]

This is more like it

That's Electrical forums she won't let me go on aswell now!!!!

 

[trev]

Sorry Trev, I got my days mixed up and thought it was Friday, Apologies lol

So that really is Mrs Mike?
GOOD LAD!

 

[R G]

Now thats more like it ....spuds can wait ....arty:

 

[Guest77]

Heaven, I'm in Heaven

 

[jaypp]

Did anyone else look at the socket? If not, my life is sadder than I thought!

 

[trev]

Let's all point and laugh

 

[R G]

Does any one know where Sarz has gone ??

 

[Guest77]

Ray I have put a nice picture up for you in Chit Chat

 

[Silly Sausage]

Heaven, I'm in Heaven

Oh aye...
HEAVEN - The World's Most Famous Gay Nightclub

 

[Guest77]

LOL Hilarious

 

[jaypp]

Let's all point and laugh

Brilliant. It's the ability to kick a man when he's down that all decent 'tradesmen' have. Now, where's the 'Hurt Feelings Form'? :lol:

 

[HappyHippyDad]

Hi all. Not a working butnvq 3 after 3 yrs at college . Looked at wife's friends cu for her. Was tripping out at random. Checked RCA times and current all ok. Cu box looked rough with large hole in the top and two bare wires poking out. Checked insulation resist of main ring got 340ohms but didn't have time to check further. Also noted that all but one phase and neutral were all loose, and the cooker and old shower cables had melted together. Removed old shower cable and made good connections and burnt wire. Main switch seemed to be rated at 63amps and as client asked for a new shower to be installed I thought that cu would need upgrading even tho it's mcb and rcd.
advised her to ask someone more knowledgable than me.
professional came in fixed tripping( bad socket upstairs) and said box ok for shower its not very old. Wiring In place is 10mm and said he would go away and come back with a quote.
Question is this. Is the 63amp rating on main switch ok for a box feeding a ring main,immersion heater, electric oven and hob, and 9kw shower and lights etc or am I misunderstanding something.

I realise I have to tell local building control of work and present them with my works done and test results. For a certificate

I'd be interested to hear what some of the more experienced chaps say to this as it does seem afair bit for a 63A switch.

If you use the OSG diversity then you've got 32A for the ring and 39A for the shower straight away so your up to 71A without any of the other circuits taken into account.

However if you use the guidelines from some DNO that does seem to get mentioned a fair bit, then you add up all the breakers and multiply by 0.4 View attachment DNO guidelines on Max demand - GOOD.pdf so perhaps (40+32+32+16+6+6) x 0.4 = 52.8A.

 

[DPG]

Eng54 will be along shortly to tell you to clamp it and then be surprised at how low the reading is! Daz

 

[GMES]

Argentina wins

I don't know mate Korea looks very nice

 

[DPG]

I'm with Korea also I think. Daz

 

[SPARTYKUS]

Ok ok Ive looked back and Korea is level pegging. You two share Korea..... i'll.....

 

[GMES]

she's bloody gorgeous Daz

 

[Guest77]

Me too, but Brasil is also a cracker, I don't like the english Lass though LOL