electrical backfeed

[plumber (new blood)]

electrical backfeed in connection with heating controls??? could anybody please explain how backfeed works.

thanks

 

[breezer]

same as water does.

electricty will always take the shortest route it can.


say you have a stat operating a pump.

if stat is open, if you measure across the terminals you will get 230v ac

although the stat switches the live, the neutral you read (with meter) is backfeeding through the pump.

in some instances the back feed can be enough to operate something that should not be operating

 

[plumber (new blood)]

yea sort of makes a bit more sense. so the neutral becomes the live? is this through a wiring faullt, say the wire is damaged? has anyone got a line diagram.

 

[DP]

If neutral is connection is live, it means the neutral connection is broken or not there.

 

[breezer]

yea sort of makes a bit more sense. so the neutral becomes the live? is this through a wiring faullt, say the wire is damaged? has anyone got a line diagram.

I suggest you read my post again and draw it on paper. No wiring error or damage


Another example is when some one thinks ther is Live an neutral at a swith and connects a 2nd light across the switch, both lamps come on at half brightness, becuse the 2nd lamp is being back fed from the first. in effect both lamps are in series, which IS a wiring error
================================
DP, your statement is not always true.

as i said,pump operated by stat when stat open you will get 230 across stat

 

[plumber (new blood)]

ok thanks for that

 

[doitall]

You can get back feed from system controls and have to fit relays to prevent it.

if you posted what the problem was.

 

[plumber (new blood)]

doitall see the posting call technical helpline........ by me

 

[doitall]

doitall see the posting call technical helpline........ by me

Why

 

[kevplumb]

doitall see the posting call technical helpline........ by me

i take it this lemon dosen't know you john

 

[plumber (new blood)]

who you calling a lemon, doitall, you said in your msg `if you posted what the problem was` it did post that in my posting named `Technical helplines........ come on keep up.

 

[doitall]

who you calling a lemon, doitall, you said in your msg `if you posted what the problem was` it did post that in my posting named `Technical helplines........ come on keep up.

Wasn't aware I did

I asked what problem.

If you mean the prog/stat

1. HW off
2. CH off
3. HW on
4. CH on

Cylinder stat
C. HW on.
1. Boiler, pump, orange.
2. HW off, grey

 

[plumber (new blood)]

no doitall, thats no what i mean the potterton PTT2 is`nt` compatible with a ep 3000 potterton time switch, it causes back feed so potterton tech say,christ don`t` tell me terminal connection on programmers and stats hahaha that stuffs my bread and butter.

my point was that some of the poeple you get through to at these tech helplines don`t` know there ar**se from there elbow, like a few poeple on this forum really.

 

[scatmanjohn]

don`t` know there ar**se from there elbow, like a few poeple on this forum really.

Name names

 

[DP]

Some people do FANCY themselves.