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Discuss Electric knife: strange wiring: request advice in the Electrical Testing & PAT Testing Forum area at ElectriciansForums.net

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The knife is Russell-Hobbs, ECO1255, model 13892.
I work for a charity which receives (among other
things) electrical goods
which must be tested before we can give them to
recipients. The PAT meter gave weird results: normally
when the device being tested is switched off the meter
says "lo load", but on this knife it did not
do so. I tested further:
when the knife is off, the resistance between live &
neutral is ~~ 1/2 Megohm. So if you leave it plugged
in & switched off, it will
draw a continual leak current 1/2 ma. (that is an
estimate: I dont have a
meter to measure this). So I opened it up &
the supply wires go
into a PCB which I assume is for radio interference
suppression. And this PCB is upstream of the switch.

Please: is the knife supposed to be made this way
or is it defective?
Am I right in my belief that this violates
the Regulations?

thank you RM Damerell
 
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telectrix

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Mentor
Arms
Esteemed
think you'll find it's perfectly OK. some appliances will give low readings due to the RF suppression.
 

ackbarthestar

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Mentor
Arms
Most likely a class II item in which case the single pole switching could be in either phase or neutral (seems to be something that our European cousins - until October - have adopted )
 

Charlie_

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Arms
Did you also check inside the plug?
Sometimes the flex can be damaged under the cord grip and needs to be cut and made off into the plug again
 

James

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Mentor
Arms
Supporter
Esteemed
many electronic , rather than simply electrical, devices have a small continuous draw whilst on standby. you should be careful doing high voltage (insulation) tests on such an appliance. it can damage the components and turn a perfectly safe and functional appliance in to a piece of weee.
 
  • Thread Starter Thread Starter
  • #6
Thank you who replied. Plug is moulded so I cannot check it,
but while the knife was open I did check correct polarity.
R-Hobbs sent an email: it is faulty.
I will probably rewire to put the PCB downstream of the switch.
 

Wilko

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Arms
Esteemed
Hi - good on you for help out and re using stuff.
In this case though, with a small £20 electrical appliance that Supplier states has a manufacturing defect - I’d just recycle it.
 

Lister1987

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Trainee
Supporter
Advent Win
Thank you who replied. Plug is moulded so I cannot check it,
but while the knife was open I did check correct polarity.
R-Hobbs sent an email: it is faulty.
I will probably rewire to put the PCB downstream of the switch.

What did they deem the fault to be and the cause?
 
  • Thread Starter Thread Starter
  • #10
What did they deem the fault to be and the cause?
(Apology: reply delayed, I have been away). They did
not tell me. I have not yet decided, but either I can
rewire to make the switch go upstream or I
condemn the knife.
 

telectrix

-
Mentor
Arms
Esteemed
just plug it in. chickens, ducks and pigs don't care which pole cuts their heads off.
 

DPG

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Arms
Esteemed
Advent Win
Thank you who replied. Plug is moulded so I cannot check it,
but while the knife was open I did check correct polarity.
R-Hobbs sent an email: it is faulty.
I will probably rewire to put the PCB downstream of the switch.
I'm a big fan of recycling stuff and avoiding chucking stuff away, but I would think carefully before modifying a product, especially if it is to be sold/given to someone else.
 

Timbo

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Arms
Supporter
Esteemed
If you modify it from manufacturer's specification you are voiding the CE certification and also becoming the "manufacturer" of that appliance.
 
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