http://www.batt.co.uk/products/index.asp?area=2&p1=20&p2=140...

YmvK-mb 600/1000V to KEMA K42 & IEC60502

Conductors: Plain annealed stranded copper

Class 1 solid conductor up to and including 6sqmm

Class 2 stranded conductor above 6sqmm

Insulation: XLPE (Cross linked polyethylene)

Core identification: 2 core (black & blue), 3 core (black, blue & green/yellow), 4 core (black, blue, brown & green/yellow), 5 core (2xblack, blue, brown & green/yellow)

Sheath/Jacket: PVC (Polyvinyl-Chloride)

Colour: Grey

Voltage: 600/1000v

Operating temperature: Maximum 90°C, minimum bending 0°C

Standards: KEMA K42,

IEC60502:Power cables with extruded insulation and their accessories for rated voltages from 1kV to 30kV

HD 405.3 & K42C-07-01 + 07-2 + 07-3

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Note added at 4 hrs (2008-09-01 04:11:09 GMT)
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it is he cable code.
Enter Cable code YMvK in google and you will find pages of ref on it.

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Note added at 10 hrs (2008-09-01 10:32:30 GMT)
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Y = 600/1000 M = Mega v = Volts to K = Kema (just a thought)
YMvK rated cable code

All I am able to come up with are the following references:

http://www.topcable.com/fitxa_desenvolupada.php?id=130#

http://www.topcable.com/news/wire/5155.html

http://www.topcable.com/news/wire/1111.html

http://www.jobarco.com/content/product.php?taal=en&id=7008

http://www.batt.co.uk/products/index.asp?area=2&p1=20&p2=140...

http://www.proz.com/kudoz/dutch_to_english/electronics_elect...
YMVKAS cable

http://kabelberekening.bbnl.nl/kabelberekening.html
A Dutch site with info in German and English. They have a HELPDESK, perhaps you can ask them for its meaning.

It seems to be used for underground cabling.

YMvKas underground cables
This cable is used particularly for installation in the ground. The armoring is suitable for use as protection line (earthling line).

http://www.brinkman.com/brinkcgi/page.cgi?l=e&t=u&g=electric...

Explanation with illustrations on page 10 of this pdf-file:
http://www.tkf.nl/documentatie/pdfEN/TKF_TwenkaplusEN.pdf



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Note added at 12 hrs (2008-09-01 12:37:04 GMT)
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http://www.kema.com/products_and_processes/downloadformquali...
HERE IS THE LINK TO KEMA. YOU CAN USE THE CONTACT FORM TO REQUEST INFORMATION ON YMvK.


Additional reference (see pages 152 and pages 162 to 166)
DATA SHEETS
YMvK-J. 0.6/1 kV. According to KEMA K42-B 04. Characteristics. Properties ......
Medium-voltage cable, XLPE insulated, copper conductor, ...
www.jhm.cz/katalog/data_sheets_2005_01.pdf - Similar pages

Agree with Tony. Leave as YMvK.

Good luck!