| http://www.w3.org/ns/prov#value | - This produces an operating voltage of at least 60 V while ensuring that the maximum shock current is less than 8 mA. This use of current-limiting resistors on large SPD windows up to 32 square feet is feasible only at lower frequencies such as 15 Hz because it is only at these lower frequencies that the SPD currents are small enough to allow the use of current-limiting resistors on larger windows.
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