OK, in that case I have no idea what the laws there say about labeling electrical equipment. Here in the US that has to be labeled. If you can't find a label on your PSU, and you can't find any paperwork that tells you what kind it is, then the safest thing to do is buy a new PSU - they are usually not too expensive around here, but I don't know what prices are like in your part of the world.
If that turns out to be the case (you end up buying a new PSU), I would suggest reposting a NEW question, which would be "what kind of PSU do I need to get to run this video card on this system" and then list all the specs that you can find about your system. Download Speccy to help identify what's installed if necessary. CPU, motherboard, RAM, HD (speed and brand if you know it), any other drives like a DVD, your sound card, how many fans you have in your system ... I may be forgetting something, but basically anything that drinks power in your system, it all needs to be added up to figure out what PSU you need.
Also you need to know the total amperage your GPU needs and make sure you have more than that on combined +12V rails - these are usually labeled +12V1 and +12V2, and they'll list amperages for each. On my PSU those values are 21A on +12V1 and 22A on +12V2, but 38A combined - so don't try to add up the separate amperages on each +12V rail, look for the specs for "Max Combined Wattage" or something similar. Here's a picture of a PSU label with all the info on it:
http://tinypic.com/view.php?pic=se3gwp&s=6
That's what you're looking for.
Also keep in mind that your PSU wattage ought to be about double the average load so that you don't make it work more that about 50% capacity - it's safer and better for the PSU.
Also make sure your PSU, whether you keep this one or get a new one, has the right kind of connector(s) for the video card you want. For instance, I currently have a Radeon HD 5770 which uses one 6 pin connector from the power supply. I was thinking of replacing it with a Radeon HD 7870, which would have needed TWO 6 pin connectors. My PSU did have a spare one. Then I found out about the new R9 770 cards - which only require ONE 6 pin connector and run at a lower power consumption. So that would be an exact replacement slot-for-slot and power-cable-wise for the existing card. So, make sure you have the right connectors for the card you want.
The other thing to make sure of is what kind of slot the GPU (video card) needs and to make sure you have the right kind. ALSO make sure that the card will PHYSICALLY FIT in the space you have for it. For example, the MSI r9 770 card is 10" long and 5" wide and takes a double slot, so I need an empty slot next to the GPU slot (below it in my case/motherboard configuration, check your configuration to make sure where the 2nd slot the card needs in relation to the video card slot).
When I opened my case and checked, I found I had plenty of room lengthwise and no problem with the slot below (it was empty), but because they chose to mount a fan on the side panel I was only going to have MAYBE 1/4" space on the 5" dimension. So I opted not to get that card after all.
So make sure you have the right card for the right type of slot. To my knowledge all modern video cards require a PCIe x16 slot (PCI Express x16) which is the longest slot on your motherboard. There are other sizes of PCIe slots that you may or may not have on your motherboard, also there is the vanilla PCI (no express) slots which may or may not appear on your motherboard. Here is a diagram that might help you figure out what type of slots you have, but the best way is to look up the specs for your board.
https://www.pcspecialist.co.uk/forums/showthread.php?15853-Pci-and-Pci-e-slots-explained
That should at least give you an idea of what you are looking at.
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