I swapped my built-in oven today and when removing my old oven, I noticed that the plastic around one of the legs on the power plug had melted and stuck onto the socket. Took some effort but after prying the plug out from the socket, this is what I see.

Any idea what happened here?

Moisture kot?

Poor contact pressure between the neutral connections making electrical arching like welding. Common failure thus very important to have full contact on all connections especially high amperage devices.

Arching.

Basically the neutral terminal at the plug is not tightened properly or got loose with time due to heat.

Thanks guys. Just checked some articles online as well and yeah, it seems that it is likely due to arcing. Have to be very careful when I replace the plug to make sure it's well fastened, and that there is no exposed wire that may lead to arcing. This could have lead to a fire.. thankfully it did not.

Will need to replace the wall socket as well.. hopefully, no nasty surprises when I open it up.

This post has been edited by Par@dox: Sep 24 2018, 06:53 PM

If you frequent use the oven and Long hour, change it to industry type socket which can take higher amp. Or use terminal to secure the connection. This is the most safer way for high amp device.

industry type socket example ? comando plug ?

Yup. I also don’t no that plug called commando plug.

But if you not taken out the plug at all, use DOL to switch. Can get from electrical shop or aircon. 32amp is more than enough.

Err.. sorry, I am unfamiliar with the terms you just used.. What are industrial type sockets? DOL to switch?

After what happened, I went around shopping for a new 15A plug to replace the above MK one. Can't seem to find a decent quality one. All seemed inferior to the MK plug. Tried searching at Homepro, Ace Hardware, etc. Any idea where to buy a good quality plug?

i think its called CEE plug first time hear it commando pulak.

The house socket have a limited current spec. In this case 15A. So how good quality it is, it still limited by the current spec.

If the oven is running almost 15A, it reach the wall socket and plug limit. It still alright with short time running.

But if running at 2-3hr or whole day ovening when festival time, that is what happening in the pic. That MK plug is already very good quality with that small melt area only. It is a UK brand.

Here is my plug melting. Quality is much worst than the MK.



This is the Schneider wall socket in the kitchen running at high current for long time.





If you really want a safer longterm switching connection, DOL starter unit (direct online starter) which normally use on the aircon or water pump is better.



A 32A DOL starter is more than enough. But the oven wiring is permanent screw into the unit. If you want to take the oven away, you have to unscrew the wire out. ( it is the best connection for high current device)

Oven should wire direct to circuit breaker. Don't use plug because it may use more than 15A.

yes its due to arching because of improper contact between socket and plug.

solution = use a cooker switch


homepro has it

It is not convenient to do the switching. The oven have to be off/on frequent.

This is 1 of the switching can be use. It have 40A rating. But direct terminal screw in.

Many brand carried this type switch.

yes. its the better solution than plug.
usually rated at 45A heavy duty

You should use something like this - industrial plugs/sockets rated at higher amp (32A recommended) for high load

http://www.profactosolution.com.my/product...ll-Mounted.html

Thanks.. learning a lot from the sharing.

This is a neat solution, and I think the socket would fit into the hole in the wall nicely.

However, one problem.. how to conceal the cabling ah? The cable for the oven would be coming from inside the wall to the socket correct?