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Can I replace a 3A plug on a light fixture (that comes with 3A cable) with a 5A plug?

The 1st problem I encountered is that the cable has 2 power lines rather than 3 which connect to the 5A plug.

Can someone help please?

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Hi, can you provide some details about your location? – Aaron Oct 2 '12 at 20:19

From the mention of 3A and 5A plugs, I'm guessing that you're in the UK (or a country that uses the same style plugs).

The only difference between a 3A and a 5A plug is the fuse, and the fuses in a UK plug are interchangeable, so to convert the 5A plug to a 3A plug, just remove the old 5A fuse and install a new 3A fuse.

Your fixture doesn't have an earth lead, meaning that it's double insulated. Connect the two wires on your light fixture to the terminals marked 2 and 4 in this diagram:

enter image description here

(Image courtesy of the Wikipedia article on UK plugs)

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