British colonial rule affected the technical standards in Hong Kong. However, not all technical standards in Hong Kong are identical with their counterparts in the United Kingdom due to practical or some other reasons.Before the legislation of the Electrical Products Regulation (a few years prior to the handover in 1997), British standard extension cables, plugs and adaptors were seldom found in the market. Electrical appliances were fitted with 2-pin plugs and quasi-UK three pin plugs (which meant they were compatible with BS 1363 or BS 546 sockets, but the plug itself did not comply with the British Standard).