The pro-combination lock folks are erring on the side of caution to ensure that you have access to your safe contents when you need it the most.
The pro electronic lock folks say worrying about an EMP is moot because:
- The e-lock is floating and not tied to the grid (they generally run off of two 9V batteries)
- The actual locking mechanism which stores the combination in a PROM is behind the steel plate door of the safe which would act as a Faraday cage. Only the keypad is exposed on the exterior of the safe.
- The required magnitude of an EMP to take out an e-lock is so large that your body would quickly succumb to the radiation exposure.
So, are the pro e-lock folks right? What would it take to take out an e-lock and would I be around to even see it?