How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • Go back-and-forth until satisfied
    Rate the answer you receive.
Ask Tim JA Your Own Question
Tim JA
Tim JA, Customer Service
Category: Appliance
Satisfied Customers: 2330
Experience:  Owner at Self-employed
106972271
Type Your Appliance Question Here...
Tim JA is online now

I'm trying to wire up a zanussi oven, it's electric and new,

This answer was rated:

i'm trying to wire up a zanussi oven
JA: Is your Zanussi oven gas or electric? How old is it?
Customer: it's electric and new
JA: What have you tried so far with your Zanussi oven?
Customer: i'm confused by the colours of the wires on the back
JA: Anything else we should know to help you best?
Customer: the model is Zanussi ZZP35901XK
Customer: replied 1 year ago.
the colours of the wires on the back are orange, blue, and green-yellow
Customer: replied 1 year ago.
green-yellow is obviously the earth
Customer: replied 1 year ago.
but which should be the connected to neutral and live?

Good afternoon, welcome to the Technical section in JustAnswer; my name is ***** ***** I will help you today.

Has this electrical supply been used before? Is this oven a replacement for another oven?
_____

If you receive a phone call offer, please ignore it - these are system generated and outside my control. My understanding is that you won't be charged if there's no phone call.

Customer: replied 1 year ago.
iit's a replacement oven
Customer: replied 1 year ago.
replacing an old smeg
Customer: replied 1 year ago.
the one imagi is the wiring for the old oven
Customer: replied 1 year ago.
the old oven was a SMEG SE335SS/1
Customer: replied 1 year ago.
as you can see for the old oven blue goes to orange
Customer: replied 1 year ago.
should blue go to orange in the new one too?
Customer: replied 1 year ago.
hello?

I'm still here, but please be aware that each expert is assisting many customers in parallel, which is how this is kept as a low cost service. Therefore, sometimes there are natural breaks between posts, however the topic won't be closed until your problem is solved.
_____

I'll have a look at your photos now and will respond ASAP.

Customer: replied 1 year ago.
thank you

While I'm looking, please could you tell me if there's a label on the new oven that shows the terminal block and the allocation of terminals?

Customer: replied 1 year ago.
no i don't see anything like that
Customer: replied 1 year ago.
oh i just looked at the wiring block and i can see some faint letters
Customer: replied 1 year ago.
orange is L
Customer: replied 1 year ago.
blue is N
Customer: replied 1 year ago.
orange should connect to blue; and blue should connect to brown right?

Please wait a moment - I'm typing my reply...

OK. I was about to say that it's highly unusual to have no markings and no label. Clearly the manufacturer hasn't made things easy for you, but you can now proceed, but unless you can see similar markings on your old oven you should be cautious.

Please treat all colours with suspicion - unless you prove the supply with a meter, it's an assumption that brown is the live in the supply.

Supply brown should go to the terminal marked 'L'.
Supply blue should go to the terminal marked 'N'.
Supply green/yellow should go to the remaining terminal.

Customer: replied 1 year ago.
are you able to tell what the wiring should have been on the old smeg oven?
Customer: replied 1 year ago.
it is slightly worrying that for the old smeg oven orange was wired to blue

Do you still have the old oven?

Customer: replied 1 year ago.
i wonder if the original electrician got the wire colours mixed up?
Customer: replied 1 year ago.
i still have the old oven
Customer: replied 1 year ago.
one of the photos showed the wiring for the old oven

Please scour the old oven for a label that shows the terminal block connections. Also look on the terminals for markings.

I didn't know how long ago you took that photo.

Customer: replied 1 year ago.
i took that photo just a few moments ago
Customer: replied 1 year ago.
i've looked for labels on the old oven but can't see any

Yes I realise now, but at the moment of asking if you still have the oven I made no assumption whether or not you had it.

Do you still have the back panel for the old oven? If so, is there anything on the inside of that?

I'm just checking the Smeg manual...

Customer: replied 1 year ago.
i have the back panel but there's nothing in it

There's nothing in the Smeg manual, as is often the case. Is there no indication at all on the plastic terminal block?

Do you need the oven to be operational tonight? If not, I have a suggestion that will result in being 100% certain of a completely safe connection.

Customer: replied 1 year ago.
i think i've confirmed that the brown wire is the the live wire as expected
Customer: replied 1 year ago.
the old oven was still connected
Customer: replied 1 year ago.
i turned the old oven back on and put a contactless voltmeter near to the brown wire -- and it beeped strongly
Customer: replied 1 year ago.
on the blue wire it didn't beep so much
Customer: replied 1 year ago.
it doesn't have to be operational tonight -- what were you going to suggest?

Are you near a Screwfix? If so, you can click-and-collect a cheap but very good multimeter and test the supply. Click here.

I will send you steps to test the supply with the multimeter.

I suggest that you don't put your faith in the inductive tester. The risk is possible to your safety, and also to the oven - if you damage it the warranty won't cover it.

The steps are:

1. Power off at the isolator to the supply for the oven.
I'm sure you've done this, and would do it, but missing out this step would be incompetent on my part.

2. On the new oven, disconnect the orange spade connector and the blue spade connector, and tape those leads out of the way so that they can't accidentally fall and touch the terminal block.

3. Connect the supply brown to the terminal marked 'L'.
4. Connect the supply blue to the terminal marked 'N'.
5. Connect the supply green/yellow to the remaining terminal.

6. Turn on the supply to the oven.

7. Ensure that you have the multimeter leads connected with the black lead in "COM" and the red lead in "V". Set the multimeter to the 600 "V~" range.

8. Hold the block probe to the Earth and the red probe to 'L' . Note the reading.
9. Move the red probe to 'N'. Note the reading.
10. Power off again at the isolator.
_____

At step 8 you should read around 240 volts.
At step 9 you should read around 0 volts.

If you got the correct reading then you can leave those connections as they are, and reconnect oven orange to the left terminal and oven blue to the middle terminal, confident that you've got it right.
_____

As for what the previous installer did, I can't comment on that. If they got it wrong, then it neatly illustrates my point about never trusting any colour, and never making any assumptions with electricity.

Tim JA and other Appliance Specialists are ready to help you
Customer: replied 1 year ago.
thank you.

You're welcome. Thank you for your rating :-)

...and your kind bonus.