This means one of the circuit conductors (called the grounded conductor in the code) is connected to ground at the service. For homes, this conductor is the neutral, but in some 3-phase systems without a neutral, one of the phase conductors is grounded. The other circuit conductors are ungrounded. This solid conductor to ground is why you can get a shock between the hot conductor and the earth, water, etc. There are countries that do not do this because they feel it is unsafe. However, this grounding of the system keeps the voltages stable.
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I have a friend who traveled from the US to Venezuela with his luggage wrapped in plastic, and some things dissapeared from his luggage, aparently someone opened it got some stuff and wrapped it again in plastic so my friend didn't notice at the airport.. Yes I think JAL used to put my backpack in a big plastic bag closed with plastic ties, but not shrinkwrapped-they just did it right on the luggage conveyor platform at the checkin desk. â hippietrail Nov 7 '11 at 8:27. yes, for backpacks it could be useful.