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The National Electrical Contractors Association's National Electrical Installation Standards (NECA 130-2010) recommends that sockets be mounted with the ground hole up, such that an object falling on a partially inserted connector contacts the ground pin first. However, the inverted orientation (with ground pin downwards) is more commonly used.
The similar Sony flash sync terminal and ISO hotshoe adapters FA-ST1AM and FA-HS1AM also offer galvanic isolation as well, but only up to 60 volts DC or AC. Flash servos and radio triggers, e.g. PocketWizard , can also provide electrical isolation, as trigger and receiver unit are physically separate.