3 ms·
For electrical safety, <50V DC is common definition for ELV. For some (probably business oriented, ie. to do price differentiation for telco equipment) reasons,
by dfox 10y ago
For electrical safety, <50V DC is common definition for ELV. For some (probably business oriented, ie. to do price differentiation for telco equipment) reasons, some electronics manufacturers classify anything over 30V as high voltage.
- asmithmd1 10y agoThe US National Electric code defines <50V as low voltage but UL defines anything over 20V as high voltage. UL generally deals with products so that is probably why they are more conservative. Picture a baby sucking on something and you can imagine why they want anything over 20V to be double insulated. If car manufactures want to comply with UL standards that would mean they would no longer be able to use the car's frame for the current return path.