My optimate's been PAT tested!

[Andy Clap]

50V and above is regarded as potentially lethal, anything lower doesn't require testing

I thought PAT testing checked the state of the plug and leads as well.  Okay, it only outputs 12V, but if the plug, lead or case is knackered you could get a 240V jolt. 
I'd have thought the 50V rule applied to the supply voltage?