Hi is this a normal MCCB or MCCB with RCD I’m unsure cause of the earth leakage relay thanks don’t really know the settings on relay I’m apprentice thanks
- Thread starter Bradley6969
- Start date
- Replies 14
- Views 2K
Discuss Main switch help please in the UK Electrical Forum area at ElectriciansForums.net
OP
Thanks so just standard MCCB?
I could be wrong Bradley, but as an Apprentice would an explanation of how an RCD works be of any help? Do you know the difference between an MCB now known as a CB and an MCCB? they are two different Animals. Are you undertaking any Training courses ? I ask because if you are then gaining acess to the training area would be of value to you, plenty of like minded Guys and Gals in that area, along with some very good mentors with years of experience. You could try posting for access to this area.
OP
I know how they work never come across this type of breaker before and not had much to do with earth leakage relays thanks
D
davesparks
If that earth leakage relay trips the mccb then yes earth leakage protection has been added to it.
The earth leakage relay would connect to a shunt trip or undervoltage release fitted inside the mccb.
The sensing for the earth leakage relay is done by a type of current transformer which surround all live conductors and this measures the earth leakage.
The below pictures show the current transformer around all live conductors (the white ring) and the shunt trip on the side of an mcb, this particular unit is a 125A TPN socket outlet.
The bottom of the enclosure is full of water as the pictures were taken to record flood damage.
![[ElectriciansForums.net] Main switch help please](https://www.electriciansforums.net/attachments/655deb9c-3d0d-4f3e-b532-13092ebc1d0a-jpeg.42535/ "[ElectriciansForums.net] Main switch help please")
![[ElectriciansForums.net] Main switch help please](https://www.electriciansforums.net/attachments/c6564f6f-3b53-4dda-9ddb-7c42aa368fe4-jpeg.42536/ "[ElectriciansForums.net] Main switch help please")
The earth leakage relay would connect to a shunt trip or undervoltage release fitted inside the mccb.
The sensing for the earth leakage relay is done by a type of current transformer which surround all live conductors and this measures the earth leakage.
The below pictures show the current transformer around all live conductors (the white ring) and the shunt trip on the side of an mcb, this particular unit is a 125A TPN socket outlet.
The bottom of the enclosure is full of water as the pictures were taken to record flood damage.
D
Darkwood
Is there any underlying reason to your original question @Bradley6969, are you just curious here or is there an issue you have been asked to address/look into?
OP
Thanks for that so say I put it on test report I’d put 60947-2 160A but would you put anything else if earth leakage was added eg
OP
Just curious came across it the other day and never had anything to do with earth leakage relays before like I came to this and looked at test report and was unsure if you put over current for this distribution circuit obviously 60947-2 160A but added leakage if you put any associated RCD
Your profile says/indicates you have nil electrical qualifications, why would you feel confident or competent in issuing an electrical report?
OP
I’m not I just want to know incase I come across in future
To be fair he said he read the report not wrote the report Pete
Reply to Main switch help please in the UK Electrical Forum area at ElectriciansForums.net
Similar threads
Also use a tails gland and clamp if available and make sure tails are secured to a wall.
The danger here is a live to earth fault in the Consumer Unit
- baazab
- UK Electrical Forum
- 7
- 527
- Question
Generally speaking local earthing will rarely be below a couple of ohms, so in parallel with a TN-S sub-ohm value will make little difference...
- JBsparky1
- UK Electrical Forum
- 4
- 677
Recommended Sponsor News
Quickwire Now Sponsor ElectriciansForums.net
I am sure you will join me in welcoming our newest sponsors of ElectriciansForums.net - Quickwire! They have decided to join us after seeing you guys discussing their products here. Now we have an expert on board that you can chat to @Quickwire-Sam who will be happy to answer your queries!
![[ElectriciansForums.net] Quickwire Now Sponsor ElectriciansForums.net](https://www.electriciansforums.net/attachments/970x90_content_banner_cqw-jpg.110414/ "[ElectriciansForums.net] Quickwire Now Sponsor ElectriciansForums.net")
@Quickwire-Sam said "At Quickwire, we're all about speed, safety, and reliability. We're a family-run business, and every Quickwire connector is proudly made right here in the UK, ensuring noticeable quality. In short, Quickwire is the fastest connection method on the market. Whether you're an experienced electrician or a DIY enthusiast, Quickwire makes electrical connections ridiculously quick and easy. We're passionate about blending British craftsmanship with innovation. If you have any questions or if there's any way we can help, please just ask me!"
@Quickwire-Sam said "At Quickwire, we're all about speed, safety, and reliability. We're a family-run business, and every Quickwire connector is proudly made right here in the UK, ensuring noticeable quality. In short, Quickwire is the fastest connection method on the market. Whether you're an experienced electrician or a DIY enthusiast, Quickwire makes electrical connections ridiculously quick and easy. We're passionate about blending British craftsmanship with innovation. If you have any questions or if there's any way we can help, please just ask me!"
PCBWay Now Sponsor ElectriciansForums.net!!
I hope you will all join me in welcoming our newest sponsor to the forum PCBWay! You can contact their friendly people by sending a message to @PCBWay who will be happy to answer your queries.
Welcome to the community and thanks for your sponsorship!
![[ElectriciansForums.net] PCBWay Now Sponsor ElectriciansForums.net!!](https://www.electriciansforums.net/attachments/970x90pcb1-jpg.110635/ "[ElectriciansForums.net] PCBWay Now Sponsor ElectriciansForums.net!!")
PCBWay provides services including PCB Prototype and batch Production, PCB Assembly (SMT), 3D Printing, CNC Machining, PCB Design, Electronics Modules Selling, etc. We are committed to meeting the needs of global makers from different industries in terms of quality, delivery, cost-effectiveness, and any other demanding requests in electronics.
![[ElectriciansForums.net] PCBWay Now Sponsor ElectriciansForums.net!!](https://www.electriciansforums.net/attachments/970x90-3pcb-jpg.110636/ "[ElectriciansForums.net] PCBWay Now Sponsor ElectriciansForums.net!!")
Welcome to the community and thanks for your sponsorship!
PCBWay provides services including PCB Prototype and batch Production, PCB Assembly (SMT), 3D Printing, CNC Machining, PCB Design, Electronics Modules Selling, etc. We are committed to meeting the needs of global makers from different industries in terms of quality, delivery, cost-effectiveness, and any other demanding requests in electronics.
OFFICIAL SPONSORS
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc
YOUR Unread Posts
-
Good Morning Thread - Come say good morning, tell us what you've got on today. :)Couldn't be more informative there mate 👍 was the drink I wondered about. The blue fake...- Latest: Dan
-
Is This Installation Wired Correctly?EICR and an EIC (Electrical Installation Certificate) for the board change hopefully with some...- Latest: PS Electrics
-
I turned off the circuit breaker for the foyer and the doorbell light went off but the doorbell transformer stayed on. Is this possible?The doorbell transformer must just be on its own power supply or another ring / zone. (I'm not...
- Latest: Dan
Thread starter
- Joined
- Location
- London
- If you're a qualified, trainee, or retired electrician - Which country is it that your work will be / is / was aimed at?
- United Kingdom
- What type of forum member are you?
- Practising Electrician (Qualified - Domestic or Commercial etc)
Thread Information
Thread Tags
This website was designed, optimised and is hosted by untold.media Operating under the name Untold Media since 2001.