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Frontier Forums
Although this might be a nuisance in game, I think it would be more realistic if some dinosaurs were just incompatible with the lighter fences:
Light Steel Fence
A Brachiosaurus/Giant Herbivore will just walk straight through the fence, as it's not strong enough
Certain carnivores will escape immediately, unless they've had their Social Genes modified to make them calmer
Velociraptors WILL try to escape, unless the fence is electrified
It's come up in other threads as well, that certain carnivores should periodically attack the fence for a few seconds, just to test it, and if it is not electrified, they will break out.
Also for your consideration: here is my dear Velociraptor who damaged the fence, got bored, then went to sleep in front of it so that the Rangers couldn't fix it...