Andy : In his format he plug slots into he recess in the socket. That allows it to fit in really tightly, compared with other designs. Plus, these ridges and grooves on the sides increase the amount of friction. That helps it to resist pullout forces even more, so it won't all out of the socket.
Karin : Yeah, but at the end of the day, how securely do you want it to be retained? If it's held in too hard, that makes it difficult to pull out.
Andy : That's true.
Karin : Plus, it could be dangerous. If you're vacuuming enthusiastically to loud music, let's say, and you pull the cord, you actually want the plug to pull out, don't you? Otherwise you might rip the cable half way out of the plug, or the appliance. Andy : So, really, we need to compare the pullout resistance of all the formats.
Karin : And determine what the ideal resistance is.
Andy : Yeah. OK. Erm, what else can we say about this one?