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What is the difference between a shunted and non-shunted tombstone?

Shoppers of ballast bypass LED Tube lights will often come across documentation in install guide specifying that the LED tube light must use a non-shunted tombstone.

Due to potential safety hazards of interacting with line voltage, (which can be as high as 277V in commercial applications), safety testing organizations such as UL have introduced standards to ensure that this product can be installed safely. The result is that most products in this category have to be installed with the line voltage input into one side of the tube.

Non-Shunted Rapid Start Tombstones Like This Are Needed

Non-Shunted Rapid Start Tombstones

This introduces a unique requirement in that the sockets must be of the T12 or "Non-Shunted Rapid Start" type. If you have a T12 fixture, you are in luck, as you have all the necessary hardware already. T8 fixtures must have the input side sockets changed to T12 sockets of the "Non-Shunted Rapid Start" type, as T8 sockets have a circular conductor that will not allow them to properly separate the line and the neutral sides of the circuit.