Many Ac/Dc power supply manufacturers are not grounding the Dc side of their power supplies. In some cases, the Ac/Dc power supply manufacturer does not offer an option to even ground the Dc side of the power supply. The Ac side of the Ac/Dc power supply is required to be grounded via the NEC.
SPGS believes that the Ac/Dc power supply manufacturers are relying on the NEC Code article 250.162 that only requires Dc system supplying premises wiring and operating at greater than 60 volts but not greater than 300 volts shall be grounded.
Reasons that the Ac/Dc power supply Dc power should be grounded.
SPGS’s recommends to ground all Dc power supplied from Ac/Dc power supplies.