>> 230V RMS at 50 Hz. (I don't see any sources stating what the allowable 
>> variation in frequency is.)
>>
>
> Frequency shouldn't vary much. Some alarm clocks are dependent on the 
> frequency of the power feed.

Yeh, the frequency depends on how much power is demanded and what generation 
capacity is online.  In a grid power system like the UK they control the 
frequency by bringing up and shutting down various power generators to cope 
with the demand.  I don't know what the short-term allowed variation is, but 
over the longer-term (eg 1 day) it is controlled very accurately, enough for 
clocks to run off it.

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