I had NO idea. I do live in an old building - 1900 and all our plugs are 2 prongs
You and I make a great team on this thread allfur. 
@Louise7777 Is it true that employers are quite strict in that some staff are expected to work longer than contracted hours and not take their allocated leave / holiday?
It totally depends on the industry, the nature of the job and the employer. If you're an auditor at a public accounting firm, you will put in a lot of overtime from January through June when annual audits are generally done. If you're an investment banker and you're working on an IPO, again, a lot of long hours. But those jobs are compensated accordingly, and there's more flexibility during the slower times. And at many, many jobs the hours are quite regular and not disruptive.
Unless you are a member of a union, most employees here at "at will" and not under a specific employment contract. In the last 20-30 years there has been much more emphasis placed on work life balance and employers treat people better in order to retain them. I'm in a fairly senior role and I have never been asked to forgo allocated leave (vacation time as we call it here, or paid time off/PTO). It's sometimes been hard to schedule, and if I can't take it all I can carry it over to the following January and use it then.
If I have an employee who is on salary and she works extra hours on a project, I give her compensatory time so that she can leave early or come in late when it's not busy. I can also let people in some roles work from home one day a week, saving them time on their commute. You have to treat people as professionals, and if you do, they'll have great loyalty to the organization.