secondary circuit that is so designed and protected that under normal operating conditions and single fault conditions, its voltages do not exceed a safe value
Note 1 to entry: For commercial, industrial and telecommunication applications, the SELV voltage limits provided in IEC 60950-1:2005 are applicable. For household applications, the SELV voltage limits in IEC 60335-1:2010 shall be used.
Note 2 to entry: The limit values of voltages under normal operating conditions and single fault conditions (see 1.4.14 of IEC 60950-1:2005) are specified in 2.2 of IEC 60950-1:2005. See Table 1A of IEC 60950-1:2005.
Note 3 to entry: This definition of a SELV Circuit differs from the term “SELV system” as used in IEC 61140. |