Hello all,
My question is providing a compliant power supply to electric delivery robots that deliver food items from a Food Store.
The power supply will be sourced from the stores electrical supply and an armoured cable installed below ground or clipped direct dependant on site specifics which then serves the delivery robots power supply unit. This PSU serves the charging hub which then provides a charging facility through induction.
The supply is SP&N and has a maximum load of circa 10A. The equipment is classed as class 1 equipment that requires an earth connection. The PSU contains only a MCB as a protective device. The majority of the stores serving the delivery robots will be a TNC-S PME supply.
Regulation 722.411.4.1 is descriptive that a PME earthing facility is not permitted to be utilised to serve an outdoor charging point, unless suitable mitigation methods are introduced.
For EV charging, this is often achieved through the provision of O-PEN protection either within the EV chargers manufactures equipment or within the DB.
To me, even though the risks are smaller than an EV charger and the Wiring Regulations are only descriptive for an and Electric Vehicle, they are still apparent if there is a loss of a PEN conductor within the network resulting in possible live metallic parts.
Would anyone be able to input on this to assess if this approach may be over engineered.
