garden shed Ze

[Pete999]

They are still in parallel L and N are the same where ever it comes from even if the supply is fed off the sockets its still Live and neutral , if it was in series then the live would enter the first rcd come out of the neutral of that RCD as a live to the live of the next RCD and the neutral would be connected to the last RCD,

View attachment 25957

Nick I think you may have misunderstood the point, 2 RCDs on the same leg of a circuit is not recommended unless some form of discrimination has been applied, perhaps with using a time delay RCD or 2 of differing mA ratings.
I get the impression you are trying to make a point about the difference between Series and Parallel, most of us know the difference.

 

[Octopus]

They are still in parallel L and N are the same where ever it comes from even if the supply is fed off the sockets its still Live and neutral , if it was in series then the live would enter the first rcd come out of the neutral of that RCD as a live to the live of the next RCD and the neutral would be connected to the last RCD,

View attachment 25957

So its Ok to have 2 RCD's in series then? I'm obviously missing your point.

The socket circuit supplying the shed is protected by a 30mA, then the shed has a 30mA RCD in it??

Thats how I read the OP

 

[nickblake]

Nick I think you may have misunderstood the point, 2 RCDs on the same leg of a circuit is not recommended unless some form of discrimination has been applied, perhaps with using a time delay RCD or 2 of differing mA ratings.
I get the impression you are trying to make a point about the difference between Series and Parallel, most of us know the difference.

Yes Pete i fully understand this and im not misunderstanding the point but when it is referred to as series it is incorrect ,they are in parallel simple as , and im not having a jab at any one, its just something that keeps cropping up and just wanted to point it out , any way every one nit pic's my posts so its my turn Lol

 

[Silly Sausage]

I disagree, RCDs aren't a load, they are devices connected in series, as in one is downstream from the upstream one!

 

[Pete999]

Yes Pete i fully understand this and im not misunderstanding the point but when it is referred to as series it is incorrect ,they are in parallel simple as , and im not having a jab at any one, its just something that keeps cropping up and just wanted to point it out , any way every one nit pic's my posts so its my turn Lol

I wasn't nitpicking mate just trying to clarify

 

[nickblake]

I know mate didnt think for a moment you where , archi they are still in parallel regardless of if they are a load or not lives are connected to lives neutrals to neutrals that is parallel

 

[Octopus]

I know mate didnt think for a moment you where , archi they are still in parallel regardless of if they are a load or not lives are connected to lives neutrals to neutrals that is parallel

ha ha, I see your point!

I still say having 2 x 30mA RCD's on the same circuit is bad practice - whether they be parallel or series!!

 

[Silly Sausage]

I know mate didnt think for a moment you where , archi they are still in parallel regardless of if they are a load or not lives are connected to lives neutrals to neutrals that is parallel

OK, they're not electrically in series, L & N are effectively electrically separate, but you could argue they are magnetically in parallel!

Me and everyone else will keep refering to them as being in series.

 

[Barry White]

Agree they are in series remove or trip the first and the second is dead in parallel it would still be energised. Either one or both may trip in fault conditions therefore no discrimination is the point that being made.
If the feeds were in parallel only the the one with a fault would trip

 

[davesparks]

Yes Pete i fully understand this and im not misunderstanding the point but when it is referred to as series it is incorrect ,they are in parallel simple as , and im not having a jab at any one, its just something that keeps cropping up and just wanted to point it out , any way every one nit pic's my posts so its my turn Lol

The coils of the RCD are in series rather than parallel, the current passes through the first live coil, then the second, then the second neutral coil then the first

 

[davesparks]

I know mate didnt think for a moment you where , archi they are still in parallel regardless of if they are a load or not lives are connected to lives neutrals to neutrals that is parallel

They are in series, on protective device downstream of another is series.

If you put one SP mcb after another it is series and you get the benefits of a series connection.
Put one DP mcb after another it is series,
Put one RCD after another it is series.

Current passes through one and then the other, if it was paralell then current would pass through each one without passing through the other.

 

[telectrix]

deffo series. in and out the first one then into the second.

 

[ChrisElectrical88]

Don't care. Series , parallel, cheese sandwich.

 

[LeeH]

Without seeing the installation I would say the ZE is taken at the incomer to your shed DB with the earth disconnected and on your cert marked down as ZE at the DB

That would be the Zdb or Zs. The Ze can only be 1 place can it not?

Cannot be arsed to read all the posts on this thread for obvious reasons.

 

[telectrix]

a series cheese sandwich is with tomato. a parallel one is with onion.

 

[Guest77]

A painful thread, very very painful.

 

[Plonker 3]

5 pages on how to take a Ze, is this the next generation of sparks standard now? No wonder the money we earn is coming down.

 

[Guest77]

Yep the standard is now lower than a jack russels wedding tackle, we are close to a snakes belly level.

 

[Plonker 3]

Evening Mike

 

[Guest77]

Evening Buddy