Offices do tend to be low risk, but the employer has a duty of care to there employee's and so has to do everything possible to ensure things are safe, it is good no faults have been found but it would only take one to potentially injure someone. The biggest hazard in office enviroments are people bringing in there own chargers for phones etc which can be cheap imports that pose a significant hazard and some employers now ban the use of such equipment.I worked in a large (1200 staff) office. Routinely someone came round to do PAT testing. I asked how many faulty appliances had been detected over the last few years - none! Time and money being spent reducing an almost non-existent risk to almost zero - daft.
The question here is define competant, easily applied to woodworking projects because you can see the final result but with electrical you need the right test equipment, without this you cannot say whether everything is correct because you cannot see circuit impedances. A problem with electrical is that you come across so many people who will say it must be alright because it works! Gas in some ways is safer because you can smell it, but the consequences can be much worse, electricity can burn the house down but gas will totally demolish it.those who take safety seriously will do a generally competent DIY job