thanks for the reply. the cable in question is from sparkpak - CP26 / 1.0 3183Y / 10 AMP / ROUND FLEXIBLE CABLE / 3 CORE.
that's all it says on the label. bought it because the assistant at the local DIY store said it would be ok for a table lamp which is what i need the extension for. only later realised there was an incompatability between ampages of cable and plug / twin sockets...
Although it is under the maximum rating as long as you fuse to correct size I would not really worry. There are loads of pre-made extension leads only rated at 5 amp so the only difference between yours and theirs is sticker saying 5 amp.
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