clampmeter on oven

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  #1  
Old 02-08-16, 05:14 AM
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clampmeter on oven

Ok so i bought an oven today and i took it home too test it out on a circuit i made in my switchboard

The circuit is a 32amp circuit breaker with 6mm cable,

ok, so i tested out my oven by connecting the 6mm red and black wire in the correct place ..

i turned all 4 hotplates on high the oven on high and the grill on ..

My new clampmeter read 41amps ..

how does this work ??
shouldnt the circuit breaker trip above 32amps ??
confused ..

Plz any info ??
 
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  #2  
Old 02-08-16, 05:31 AM
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Divide the wattage rating of your appliance by the house voltage to get amps. If the result is 41 amps, I would get a new circuit breaker. If the result is close to 32 amp, I would consider getting the clampmeter calibrated or a new clampmeter.
 
  #3  
Old 02-08-16, 06:00 AM
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thank you Bob ..
what other device can i use too accuratly measure the use off current off this oven ??
 
  #4  
Old 02-08-16, 06:50 AM
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I suspect your clamp on meter is fine.

A circuit breaker does not trip exactly at the current it is rated for, the tripping will depend on how much current it is over, and how long it is over. This is called an inverse time circuit breaker.

Your oven is drawing about 9 amps over what the breaker is rated. The breaker will likely hold this for some time but will eventually trip soon enough that no damage will be caused to the wire insulation. How long will depend on how much current it is over.

You should make sure the circuit is sized properly to handle the load. Check the nameplate of the oven for the info of the circuit required.
 
  #5  
Old 02-08-16, 07:08 AM
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thank you tolyn,

lights, gpos, fans are easy too install but when it comes too ovens things get more complicated as the correct sized cable with the correct sized circuit breaker must be used.

this post is too ask,
how do i find out the exact current rating off cables ?? e.g. 1.5mm - 2.5mm - 4mm - 6mm etc is there a table or something ??

i know that the cable has too rated higher than the circuit breaker as you want the breaker too trip before the cable burns

thx ..
 
  #6  
Old 02-08-16, 07:11 AM
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maybe i should make a new thread about cable ratings ..
 
  #7  
Old 02-08-16, 10:56 AM
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1.5mm = #14 AWG = 15A
2.5mm = #10 AWG = 30A
4mm = #6 AWG = +/- 60A
6mm = #3 AWG = +/- 90A

Metric sized wiring is not exactly the same size as our wire.
Also.... the maximum ampacity is also determined by insulation.
 
  #8  
Old 02-08-16, 03:29 PM
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Yes, insulation on the wire/cable has more to do with the rating. Copper wire can carry a lot of amps before it will melt, but the hotter the wire gets the sooner the insulation will degrade to the point of melting or burning.
 
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