that last thread?

[iamelectric]

can someone answer the question to the rewire thread without an argument breaking out , as this was also my understanding and if its not right i will have to ring the council in the morning as they rewired my house a year ago with no mechanical protection and cables plastered into the walls , i dont want everyone saying this is bad practice or i wouldnt do a job like that just want to know if it complies with the regs and if not what ones , cheers

 

[GLENNSPARK]

do you state that a rccb or rcd should never be used as a main switch , what if theres a standalone dp isolator

a DP iso...is just a switch....isn`t it...
it needs to be manually operated..

unlike an RCD...which is ADS....
so...you wouldn`t use a means of ADS would you as a main switch on a main board...

 

[glasgospark]

a DP iso...is just a switch....isn`t it...
it needs to be manually operated..

unlike an RCD...which is ADS....
so...you wouldn`t use a means of ADS would you as a main switch on a main board...

ok agreed , but with a rcd main switch and a stand alone dp isolator how about that

 

[Badged01]

ok agreed , but with a rcd main switch and a stand alone dp isolator how about that

By definition a main switch is required to isolate all the circuits in the installation. If you had a series of DB's and the main switch that isolated them all was an RCD main switch (regardless of the dp isolator), then a fault on any DB tripping the RCD main switch would effectively trip all the DB's. Not what you want unless it was a time delayed RCD giving discrimination with the DB RCD's!

 

[Badged01]

Hence why I don't always put capping over as its not a form of "additional protection" as people don't tend to like 3mm steel capping rounded their front room!

Clearly my definition of mechanical protection and additional protection are different to yours .....

 

[iamelectric]

forget about the main switch question for now what was wrong with the original question he asked

 

[uksparks]

ok agreed , but with a rcd main switch and a stand alone dp isolator how about that

Have I missed something or do I just not know what you are trying to understand or get at?

 

[glasgospark]

so why wylex-crabtree etc manufacter these rccb-rcd main incomer

 

[uksparks]

It all sounds like very basic stuff to be honest that should not be asked by any half competent spark.

 

[glasgospark]

It all sounds like very basic stuff to be honest that should not be asked by any half competent spark.

ill be honest i always fit dual rcd mk or wylex but i did fit rcd main switch type today and i had questioned it myself , i know that 1 fault on 1 circuit would trip all but i thought it would be not best practice not against regs

 

[DPG]

ill be honest i always fit dual rcd mk or wylex but i did fit rcd main switch type today and i had questioned it myself , i know that 1 fault on 1 circuit would trip all but i thought it would be not best practice not against regs

Murdoch sums it up nicely in post 12. And gives the appropriate reg. Daz

 

[Marvo]

There's nothing wrong safety or electrically speaking to use an RCD as a main isolation device. It would be poor design due to the inconvenience that would be suffered by the users of the installation. Any leakage anywhere on the installation would cause complete power outage.

 

[glasgospark]

There's nothing wrong safety or electrically speaking to use an RCD as a main isolation device. It would be poor design due to the inconvenience that would be suffered by the users of the installation. Any leakage anywhere on the installation would cause complete power outage.

this was my thoughts exactly only upgrade would be dual rcd then or high integ with rcbos

 

[uksparks]

There's nothing wrong safety or electrically speaking to use an RCD as a main isolation device. It would be poor design due to the inconvenience that would be suffered by the users of the installation. Any leakage anywhere on the installation would cause complete power outage.

Exactly, which is why it's a total dumb --- idea doing such a thing! There's no excuse to really. I couldn't have put it better myself.

 

[GLENNSPARK]

ok agreed , but with a rcd main switch and a stand alone dp isolator how about that

eh?...

 

[Marvo]

WhereI am it's standard domestic installation to have a single RCD(with overload) used as the main OCPD and isolator and MCB's supplying the radial circuits. Wholesalers around here won't even have RCBO's on their shelf.