Welcome Guest ( Log In | Register )

Bump Topic Add Reply RSS Feed

Outline · [ Standard ] · Linear+

 RCCB for Water Heater

views
     
lankorn
post Oct 5 2023, 01:05 AM

Getting Started
**
Junior Member
125 posts

Joined: Mar 2009
QUOTE(stormer.lyn @ Oct 3 2023, 08:57 PM)
I believe you will have unnecessary tripping faults. You have made a common Neutral busbar for both the top RCCB (Marked "40A 30mA" - Let's call this RCCB1) and the bottom RCCB (Marked "63A 100mA or 40A 30mA" - Let's call this RCCB2)

This may happen : Current flows through RCCB1 live > MCB 16A > socket in room > appliance > Neutral wire back to DB > Neutral busbar > [b]RCCB2 Neutral.
Your RCCBs will trip. You have to split the Neutral busbar for RCCB1 and RCCB2.

The WH Neutrals must be connected to the RCCB2 Neutral busbar, as the current to the WH originated from RCCB2.

Also, physically, when I am making the connections, I would connect the 10 mm² wires together. This is for the WH Live. In the drawing it is connected through the Live busbar at each end. Potentially the Live busbar will heat up.
*
May i know why you say so?Do you mean to have 2 separate Neutral busbar?
Eventually all the Neutral will be connect back to incoming(main) Neutral right?

This post has been edited by lankorn: Oct 5 2023, 01:07 AM
lankorn
post Oct 5 2023, 01:30 AM

Getting Started
**
Junior Member
125 posts

Joined: Mar 2009
QUOTE(ceo684 @ Oct 5 2023, 01:20 AM)
Actually on second thought. Why not just use a single 63 0.03 RCD since it’s on single phase. There is no need to split DB.

It’s because the neutral group of circuits on RCCB A should not be mixed with neutral group of circuits on RCCB B before passing the “checkpoint”.
*
I cannot understand biggrin.gif .Can you draw?

This post has been edited by lankorn: Oct 5 2023, 01:30 AM
lankorn
post Oct 5 2023, 10:56 AM

Getting Started
**
Junior Member
125 posts

Joined: Mar 2009
QUOTE(ceo684 @ Oct 5 2023, 01:49 AM)
Mixing your neutrals BEFORE the RCD "checkpoint" has different implications.

U know how shops like genki sushi and sushi king charge for per-plate kaiten belt sushi?
RCD operates like u eat, u pay for your plate tower.
Now let's say I eat, I don't know you, but I put my plates into your table.
*
Got it.Thanks for the explanation with the picture man thumbsup.gif
lankorn
post Dec 13 2023, 10:13 PM

Getting Started
**
Junior Member
125 posts

Joined: Mar 2009
My friend asked to upgrade the DB in his house which is old.Just want to clarify what is the main ingredient of a DB,i mean for the current modernized DB?
Which one is better,the main switch or the isolator.I believe we dont use the isolator nowadays.
He wants to upgrade the DB box that can accommodate more MCBs...i think 26 way would be fit

user posted image
user posted imageuser posted image
lankorn
post Dec 14 2023, 02:16 PM

Getting Started
**
Junior Member
125 posts

Joined: Mar 2009
QUOTE(stormer.lyn @ Dec 14 2023, 09:20 AM)
What do you mean "main ingredient"? All items in the DB are important and should be considered before installation.

As for the input isolation, the use of an electronic isolator or a fused isolator doesn't matter. Make sure it is double poled to isolate both the live and the neutral for safety.
*
The ingredient i meant is the main part biggrin.gif .Im just asking because nowadays can see a lot of smart devices installed inside DB such as power monitoring and auto-ON breakers.
And the old devices like ELCB replaced with RCCB nowadays.But just want to ask,can we install both ELCB and RCCB or RCCB alone is sufficient?
As for the isolator i think the switch type is better than the fuse type.Switch type will trip if anything and just need to reset but the fuse type need to replace the fuse.
« Next Oldest · Home Renovations and Interior Design · Next Newest »
 

Add ReplyOptions
 

Change to:
| Lo-Fi Version
 0.0249sec    0.33    7 queries    GZIP Disabled
Time is now: 1st December 2025 - 08:55 PM
All Rights Reserved © 2002- 2025 Vijandren Ramadass (~unite against racism~)
Removal Request
Powered by Invision Power Board © 2025  IPS, Inc.