Predictions please...

[RF Lighting]

As mentioned earlier in the week, I've had my test rig out again today.

0.75mm² 3183-B loaded to 6A as per table 4F3A for 2 hours. Starting temperature and ambient temperature is 6.8°C. What's going to happen?

 

[DetlefSchmitz]

For one thing, I think the temp you read may be lower than the actual temp, because of the spread in the sensitive area of that type of sensor. There are pictures in the instructions showing the shape of the area measured.

Having said that, I bet it doesn't rise a lot.

 

[EFLImpudence]

Having said that, I bet it doesn't rise a lot.

Agreed.

 

[RF Lighting]

I'm pretty sure the thermometer is reading accurately. The results are now in.

As it's quiet on here tonight I'll post the results tomorrow, to give a few more people time to have a prediction.

 

[disinfo]

What are you using to load up the cable?

 

[RF Lighting]

An electric fire and a halogen lamp on a dimmer to get the loading right.

 

[disinfo]

Ah, creative I was imagining something photonicinduction like (YouTube if you haven't seen him).

 

[RF Lighting]

In my dreams

 

[JohnW2]

Having said that, I bet it doesn't rise a lot.

Agreed.

Since I started this with my 'prediction', I also have to agree - certainly nowhere near 70 °C.

Kind Regards, John

 

[EFLImpudence]

Have you enough electric fires to find at what current it melts slowly?

 

[DetlefSchmitz]

OK I've cheated and calculated it - I guess 7°C.

Edit: I mean rise of 7°C.

 

[RF Lighting]

Have you enough electric fires to find at what current it melts slowly?

Oh yes........

 

[333rocky333]

id say at least double the temperature and the flex may feel warm to touch

 

[JohnW2]

Have you enough electric fires to find at what current it melts slowly?

I can't speak for 'melting slowly', but if you have any interest in 'melting quickly', I think the fusing current of 0.75mm² copper is around 75A -quite a few 'electric fires'!

Kind Regards, John

 

[RF Lighting]

If I run out of electric fires, I've got an arc welder....