mm wire

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papa smurf

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Does anyone know if there is an ampacity chart for mm2 wire that they use in the uk. Ive got 240mm and cant find a chart on the net anywhere. Hope you can help.

Thanks,

Papa Smurf
 
Try a google search for 'metric ampacity chart.'

Failing that, the CM area for the cable you mentioned is 305.58 because I converted it for you. You're welcome. ;)

Use the ampacity for a 300 MCM conductor.
 
You are absolutely right. There was a huge flurry of activity at my desk while I tried to figure out what I did wrong, but I found it. :) My eyes saw the word 'mils' and my brain wrote the word 'mm'. Not the same thing. :)

Now that I'm using the right equation, I get 474 MCM.
 
Thanks for the link. I'm printting it out also. I can't tell you how medical equipment compaines all talk metric. After a length, they always give the english equivalent. But no such luck for wire sizes.

Typical example:

"Use a 25 mm conductor for lengths up to 10 meters (30 feet), and a 70 mm conductor for lengths up to 20 meters (60 feet)......"

Apparently we aren't the only ones that don't have this conversion handy.

Steve
 
papa smurf said:
Does anyone know if there is an ampacity chart for mm2 wire that they use in the uk. Ive got 240mm and cant find a chart on the net anywhere. Hope you can help.

Thanks,

Papa Smurf
Click to expand...
BS7671 - Requirements for Electrical Installations gives ratings.
But you need to know type of cable, method of installation and ambient temperature.
i.e.
Single or multi-core?
Armoured/non/armoured?
In conduit or clipped to a perforated cable tray?
PVC, rubber, XLPE?
etc.

BS 7671 isn't free but I have a copy so, if you have more detail, I can give you the ratings.
 
steve66 said:
After a length, they always give the english equivalent.
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Don't confuse English with British.
:wink:
Anyway, metric units are not exclusively English or British. They are SI (Syst?me International) units.

In UK, SI is almost always used in engineering but I'm old enough to have to have been taught both SI and Imperial. For engineering calculations, SI is generally simpler in my experience.
 
Hey, thanks for your help. The cable being installed is a multi-core armored cable. It is a El Sewedy Cable. 4x240mm2 0.6/1kv cu/ xlpe/swa/pvc. It is being used for direct buriel in the country of Iraq. I am an electrical auditor from the states. No one seems to know the ampacities for the wire in this country. I want give up til find the answers. Thanks for all your help.

Thanks
 
papa smurf said:
Hey, thanks for your help. The cable being installed is a multi-core armored cable. It is a El Sewedy Cable. 4x240mm2 0.6/1kv cu/ xlpe/swa/pvc. It is being used for direct buriel in the country of Iraq. I am an electrical auditor from the states. No one seems to know the ampacities for the wire in this country. I want give up til find the answers. Thanks for all your help.

Thanks
Click to expand...
Laid in ground, around 430A, but you might have to apply a 0.87 derating factor for operation at 50degC.
 
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