bath tub

Help Support Talk Electrician Forum:

jaguar1

Junior Member
Joined
Jun 16, 2008
Messages
23
Reaction score
0
If i cross bond hot cold and bathtub and the earth return path is a poor reading.Can i run another earth wire from the bath to the MET at the cut out, as connecting this earth wire to the light circuit and shower circuit will look terrible , or can i connect it to the earth bar in the consumer unit ?

If all circuits in the bathroom are protected by an rccd do i have to bother cross bonding , thankyou .

 

extension15

Distinguished Member
Joined
Feb 13, 2008
Messages
1,659
Reaction score
0
If i cross bond hot cold and bathtub and the earth return path is a poor reading.Can i run another earth wire from the bath to the MET at the cut out, as connecting this earth wire to the light circuit and shower circuit will look terrible , or can i connect it to the earth bar in the consumer unit ?If all circuits in the bathroom are protected by an rccd do i have to bother cross bonding , thankyou .
My personal view here is:

RCD the bathroom (17th edition), then forget the cross bonding...

But I ask is there any underlying reason why your measurements are poor?

:|

 

Admin1

Forum Founder
Joined
Feb 6, 2008
Messages
10,278
Reaction score
-1
My personal view here is:RCD the bathroom (17th edition), then forget the cross bonding...

But I ask is there any underlying reason why your measurements are poor?

:|
If you can prove disconnection times EXT, then it can be reduced / Omitted.

 

steptoe

of course Im wrong, ask my wife™
Joined
Feb 13, 2008
Messages
24,344
Reaction score
119
Location
Gtr Manchester
if, and its an if,

you want to go by bs7671,

then there is no reason why you couldnt run the bond back to the MET,

CPCs are acceptable as cross bonding in the bathroom,

someone look up the reg please, mine are numbered in roman numerals, :^O :^O:^O

but as has been asked, is there some underlying reason as to why the readings should be high?

 

patspark

Senior Member
Joined
Mar 26, 2008
Messages
243
Reaction score
0
Location
London
if, and its an if, you want to go by bs7671,

then there is no reason why you couldnt run the bond back to the MET,

CPCs are acceptable as cross bonding in the bathroom,

someone look up the reg please, mine are numbered in roman numerals, :^O :^O:^O

but as has been asked, is there some underlying reason as to why the readings should be high?
back to the met is not supplementary bonding

 

The Godfather

Retired
Joined
Mar 24, 2008
Messages
1,302
Reaction score
0
If i cross bond hot cold and bathtub .
If the hot and cold pipes to a metal bath are bonded, there is no need to bond the bath as well.

The Godfather

 

steptoe

of course Im wrong, ask my wife™
Joined
Feb 13, 2008
Messages
24,344
Reaction score
119
Location
Gtr Manchester
back to the met is not supplementary bonding
its not, but there it joins to the cpc for the shower and light and the cpc for those circuits are permitted as supplementary bonding.

I could go look up the reg, but in all honesty i cant be bothered, too late.

I'll have a look tomoz if i remember.

 

extension15

Distinguished Member
Joined
Feb 13, 2008
Messages
1,659
Reaction score
0
Surely, supplementary bonding in a bathroom is about creating a local zero potential zone (between all relevant metalwork)...

The problem with a running a cable back to the MET is it could be disconnected or even damaged, rendering the supp bonding in the bathroom non compliant..

(just my thoughts..)

; \

(16th edition) supp bonding can be just outside the bathroom (loft space or adjacent room/cupboard)

 
Joined
Mar 7, 2008
Messages
9,994
Reaction score
0
Location
In the office again.
Sorry steptoe, but IMHO, Ext is right here. CPC`s can`t be classed as supp. bonds because, in the majority of cases, they won`t have a large enough csa. Shower exempt, of course.

The run back to the MET, then back to the bathroom could provide a reading, in some cases, in excess of 1 ohm. You really trying to say that would be acceptable????

 

steptoe

of course Im wrong, ask my wife™
Joined
Feb 13, 2008
Messages
24,344
Reaction score
119
Location
Gtr Manchester
Sorry steptoe, but IMHO, Ext is right here. CPC`s can`t be classed as supp. bonds because, in the majority of cases, they won`t have a large enough csa. Shower exempt, of course.The run back to the MET, then back to the bathroom could provide a reading, in some cases, in excess of 1 ohm. You really trying to say that would be acceptable????
I have no problem with that,

but why o why does the precious BS&^&! (7671)say that is acceptable?

I will deffo get the reg for tomoz, was too lazy today cos i tot some1 else woulda had it.

I totally agree guys, thats yet another reason that i think 7671 is a load of baby bits!

contradictions all over.

tho, why would the lighting cpc not be adequate to handle the fault if its good enough for the fault on the lighting circuit?

surely the cross bonding and the shower cpc can handle their own respective faults?

and the lighting cpc can handle any indirect fault thru its own.? (serious Q there)

I reckon someone needs to go to my post on 'sparks own house' and look at how i propose to do my own bathroom. :D :D

dont seem so silly now ? does it?

 
Top