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Tech Note | Station DC Supply vs Float Voltage Verification In PRC-005


In PRC-005 at the 4 monthly inspections the requirement is to verify The Station DC Supply Voltage. Then at the 18-month inspection it calls for the Battery Charger Float voltage to be verified, the question often asked is what the difference between the two voltages is, and how do we measure them.

The only indication within the standard as to an acceptable methodology is in Table 1- 4(f) Exclusions for Protection System Station DC Supply Monitoring Devices and Systems.

Table 1-4(f) details the acceptable methods of remote monitoring, by which the individual elements of the onsite inspections can be eliminated. This technical note will clarify the differences in these parameters with respect to the PRC.

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