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Where I am we need to follow approved wiring methods and conduits per the NEC.
I have never known a rodent to chew through schedule 40 PVC but I guess your gophers could be much bigger than ours.
***! Do those critters chew threw your house at night and eat the pets and children?
Here we do direct bury, I guess we have better mannered gophers.
Be sure you live your life, because you are a long time dead.-Scottish Proverb