An interesting read on RCD’s

[Dozer 73]

Sent this today by our engineering manager , an interesting read regarding rcd protection
RCDs: everything an electrician should know - IET Electrical - http://electrical.------.org/wiring-matters/68/rcds/index.cfm

 

[Deleted member 26818]

Type B RCDs are still pretty rare, but not as rare as type B RCBOs.

 

[haptism]

Good article; then if a circuit has USB sockets, then what type RCD would it need. Thought it would not need other than usual AC type as the USB ELV bit is separated from LV (at least the bonafide ones) are they not. ?

 

[gazdkw82]

Great article.

I will defo brush up on the different types of RCD’s. It’s not very well known about the different types. I would never have known the wrong rcd in the wrong installation could render it useless

 

[suffolkspark]

so is it saying if an installation is fitted with the most basic types of rccb or rcbos, then later say solar pv is installed,,,, then they all need changing because they wont work properly?

 

[Deleted member 26818]

so is it saying if an installation is fitted with the most basic types of rccb or rcbos, then later say solar pv is installed,,,, then they all need changing because they wont work properly?

Yes.

 

[lurch]

very interesting.......... very surprised my inspector has never brought this topic up. I feel a non conformancy coming on . . . .

 

[lurch]

. . . . off topic here, but cant find the "post a new topic button". . . . help!

 

[Richard Burns]

. . . . off topic here, but cant find the "post a new topic button". . . . help!

Post new thread still seems to be in the top right hand corner of the page, has yours disappeared?

 

[Deleted member 26818]

Nothing there for me.
Found it.
Have to click on home, then forums, then the forum you want to post in.

 

[Ian1981]

so is it saying if an installation is fitted with the most basic types of rccb or rcbos, then later say solar pv is installed,,,, then they all need changing because they wont work properly?

Where a microgenerator having a d.c. source does not incorporate the equivalent of a transformer providing at least simple separaton between the d.c. and a.c. sides, an RCD installed for fault protecton by automatc disconnecton of supply or for additonal protecton (IΔn ≤ 30 mA) must be of a type that will operate as intended in the presence of d.c. components in the residual current. (This does not apply where it has been established – such as from a specifc writen statement given by the inverter manufacturer – that the inverter provides galvanic isolaton between the d.c. and a.c. sides that prevents it from feeding d.c. current into the electrical installaton.)

 

[gazdkw82]

So an rcd in this type of installation...would it still pass trip tests? Ramp tests?

 

[suffolkspark]

so are PV installers trained so as to be aware that they're installations could render an existing electrical one unsafe? and also on larger installations where a solar PV set may be running off 1 did board, is every other rcd/rcbo in the installation effected of will the DC current just bugger off upstream? where is it trying to go.... ?

 

[lurch]

Post new thread still seems to be in the top right hand corner of the page, has yours disappeared?

thx. . . .

 

[Deleted account]

This is exactly why I am part of this brill forum.

Nice one dozer73