Full rcbo boards????

[D00DY_T00DY]

Hi all,

Probably going to seem like a novice question just wondering what techniques you lot have for full rcbo boards to keep it neat.

Put 5 in today for a temporary supply for ground workers on a genny; earth rod with a Zs of 2.13ohms (fairly good?)

Anyway it was a complete nightmare trying to keep it neat with the earth and neutral flexes out of them.

I've only installed less than 10 just wondering all your techniques for rcbos?

I kept all the length on these and tried to coil them nicely behind the cpc and neutral terminals.

 

[davesparks]

Wonder if it actually makes a difference or it's just them putting their tin hats on.

Duely noted though.

Yes it does make a difference, cables bundled tightly together get hot. I've replaced a couple of rcbos with overheated neutral tails over the years, some from bundling up and some from a lack of ferrules. It's always been on the larger sizes of rcbo where the neutral tail is seeing it's full rated current.

 

[Ian1981]

Does your boss not include you in the testing process? Did you see him set up temporary electrodes and test the earth rod at any point in time?

Your Zs measurement almost certainly did not include the earth rod. You will have been testing via the cpc straight back to the star point via the N-E link at the generator

With a generator fed installation the earth electrode is the earth reference of your TNS system. In comparison to a normal installation the generator is equivalent to the substation transformer.

Yeah the rod doesn't form part of the earth fault loop impedance path so an earth electrode tester is the only way to test the electrode.

I was given a value of below 200 ohms which is also mentioned in the on suite guide for installing generators over 10kva.
I know the supply electrode at the transformer end in a substation set up is normally quoted at 21 ohms max.

Ze Seams high tho if the generator is a TNS which they normally are.

 

[D00DY_T00DY]

Does your boss not include you in the testing process? Did you see him set up temporary electrodes and test the earth rod at any point in time?

Your Zs measurement almost certainly did not include the earth rod. You will have been testing via the cpc straight back to the star point via the N-E link at the generator

With a generator fed installation the earth electrode is the earth reference of your TNS system. In comparison to a normal installation the generator is equivalent to the substation transformer.

Hardly if ever. Going to ask soon since I'm going into my forth year in July.

I didn't see him do that. Haha looks like he's been caught out.

Main supply is coming in soon, the company wants it connecting upto that once it gets put in.

 

[tomspark93]

I always shorten and ferrule the Neutral and Functions Earths. That's if i'm not installing the SBS compacts as Lee mentioned. They are a joy to work with!

 

[D00DY_T00DY]

I always shorten and ferrule the Neutral and Functions Earths. That's if i'm not installing the SBS compacts as Lee mentioned. They are a joy to work with!

View attachment 36668

Just seems so wrong with nothing in the neutral bar
Top job by the way

 

[westward10]

What is the unterminated cpc to the left for.

 

[tomspark93]

What is the unterminated cpc to the left for.

The lids have a bolt in with the lug is connected too.

 

[davesparks]

Hardly if ever. Going to ask soon since I'm going into my forth year in July.

I didn't see him do that. Haha looks like he's been caught out.

Main supply is coming in soon, the company wants it connecting upto that once it gets put in.

There are a scary number of electricians who don't seem to understand the subject. A lot of electricians don't go near independent generator supplies and so never have the need to think about it.

 

[Deleted member 26818]

What is the unterminated cpc to the left for.

Think your eyes are playing tricks on you.

 

[westward10]

Think your eyes are playing tricks on you.

It is bolted to the left side panel with one end unterminated.

 

[The Ghost]

It is bolted to the left side panel with one end unterminated.

He did say for the lid.

 

[westward10]

He did say for the lid.

Ah yes didn't read that

 

[Midwest]

The only thing I don't like about RCBO's, is there's no obvious sign as to whether it's the rcd or mcb element that has tripped. I understand most user instructions suggest trying to reset 'once', and sparks flying out of the thing might give the game away, but you'd think the manufactures might of developed some form of visual indicator (someone's gonna tell me there is). Seem to recall the early MK RCBO's tripped to the half way point, if it was the rcd?

 

[Andy C]

Cut and ferrule for me every time.

Like to leave a little bit length still so the RCBO isn't completely useless if it does need to be moved a little in the future.

View attachment 36659

That looks good with the tails all ferruled, i think I will be doing that myself

 

[davesparks]

That looks good with the tails all ferruled, i think I will be doing that myself

Hopefully you always fit ferrules to flex in crew terminals, as otherwise you are not complying with the regulations!