I live in the UK and I am going on holiday to Taiwan/Japan where the voltage is 110/100v as opposed to 220 here (i think).I was wondering if I could use a power extension cable (with multiple sockets) so that i would only need one adaptor to connect the extension to the mains and then I could just simply plug my 3 pin plugs into the cable saving me money and sockets. As it would be a lower voltage, I assume that there shouldn't be any problems with power however, if there are any electricians or anyone who has done this before I would really appreciate some guidance just to ensure that this is safe.Thanks is advance.
Using your 220 extension cords and outlet strips on a lower voltage will not damage them or your devices, which of course will be receiving whatever voltage your cord is plugged into. You will need a transformer if any of your item(s) won't work at 100 volts. The same is not true for for running surge protected outlet strips intended for use at 120 volts in countries where the mains voltage is higher. Don
You'd use the correct AC power cord that replaces the toggle-head part, and that would be the best part. These can be bought with a variety of different ends on them; while the adapter itself will work with any of the supported voltage ranges, automatically.
An extension cord is just more wire. Wire doesn't care about voltage. (The insulation does care about voltage, but they're all rated to handle up to at least 300v). Same with terminal strips (multiple sockets). In either case, you're problem is not handling the voltage, but handling the different plug styles from one country to the next. In the UK, the prong are round, where in Japan, the prongs are bladed.