RCD
An RCD (residual current device) is a protective device that cuts the power when it detects current leaking from a circuit, for example because of a fault. It is designed to protect people from electric shock, and it trips when it senses that problem.
Where you'll see it
You may come across an RCD as a switch or device on a hook-up post, an electrical box or a lead. Sites set their own rules on protective devices and the adaptors they accept, so check before you travel. If you see one, treat it as part of the site's supply, not something to change.
What to check
- The site's rules on protective devices and adaptors, which you should ask about before you travel.
- That any lead or adaptor you bring is the type the site permits.
- The labels and manual for your equipment, which may mention protective devices.
- What to do if it trips: unplug the equipment you were using and tell site staff. Don't try to repair, modify or bypass the device yourself.
Related terms
- Hook-up: the campsite supply the protective device sits within.
- Hook-up cable: the lead that carries the supply to your equipment.
- Load: the total demand you check before plugging in, which matters if a supply trips.
Read more: Electric hook-up explained (UK), which covers what to do if a supply trips.