UL 1950/CSA 22.2 No. 950
Note: The list below is not complete. There are over one hundred differences between this standard and IEC 60950. Please refer to the standard itself for full information.UL 1950/CSA 22.2 950 is applicable both in the USA and Canada. The current version is the Third Edition, which is
based on the second edition, fourth amendment of IEC 950. The following is a list of the major differences between this standard and IEC 60950:
- Equipment covered by UL 1950/CSA 22.2 No. 950 must be able to be installed in accordance with the National Electrical Code NFPA 70 and the Canadian Electrical Code, Part 1, CSA 22.2.1; CSA 22.2 No. 0
Component Requirements (Annex P). Unlike EN
60950, which is not associated with a particular test house, UL 1950/CSA 22.2 950 is very closely tied in with Underwriters Laboratories and CSA. The IEC standard requirements for components are replaced
by the appropriate UL and CSA standard requirements for components.
Terminal sizes must be in line with standard cable sizes as specified by the NEC and CEC, and not as given in Table 13 of IEC 60950 (Annex NAE).
Special fuse replacement marking for operator accessible fuses is required, as an example: "CAUTION: For continued protection against risk of fire, replace only with same type and rating of fuse"
(Annex NAA)
Panel providing access to a capacitor storing hazardous charge must be marked to identify capacitor and risk of electric shock. For example: "CAUTION: ...(identification of capacitor) stores a
hazardous charge" (Annex NAA)
The capacity of connection between earthing terminal and parts required are to be earthed evaluated according to CSA C22.2 No.0.4, Bonding and Grounding of Electrical Equipment. (2.5.11)
Vertically mounted disconnect switches and circuit breakers shall be oriented so up position of handle is the "on" position. (Annex NAE)
For Canada, fuses in the neutral conductor are only permitted for equipment rated up to 125 V, 15 A. (Annex NAE).
External interconnecting cable assemblies have several requirements, see 3.1.12 and Annex NAE.
Flexible cords provided with attachment plug shall be rated at not less than 125% of equipment current rating (3.2.1)
Permanently connected equipment shall have provision for connecting and securing a field wiring system (i.e. conduit, or leads etc.) in accordance with the NEC and CEC requirements (3.2.2 and Annex NAE).
Permanently connected equipment shall be provided with terminals or leads. Leads shall be not smaller than No. 18 AWG (0.82 mm˛) and not less than 152 mm in length for connection of field installed wiring
(3.2.2 and Annex NAE).
Length of power supply cord shall not exceed 4.5 m and shall not be less than 1.5m unless intended for a special installation. (3.2.4 and Annex NAE).
Terminals must be suitable for the wire gauges commonly used in the US and Canada and must accept current carrying conductors rated 125% of the equipment current rating (3.3.5, Table 13 and Annex NAE).
The mounting means for equipment intended for wall or ceiling mounting shall withstand a force of four times the weight of the unit, but not less than 5 kg. (4.1.6).
The loading test for equipment with handle or handles, supporting more than 9 kg. is four times the weight of the unit (4.1.7).
Requirements for lasers are contained in the applicable national codes and regulations (21 CFR 1040 and REDR C1370) (4.3.12 and Annex NAE)
Battery cells are to be evaluated with respect to over charging, unintentional charging, and rapid discharging as appropriate (4.3.21)
There are reduced maximum acceptable TNV circuit levels for other than ringing signals (6.2.1.1 b)
Restrictions to access of bare conductive parts of TNV circuits in battery compartments also applies to TNV-1 circuits (6.2.2.2).
Equipment which is intended for connection to a telecommunication network that uses cable subject to overvoltage from power line failures, shall comply with additional requirements (6.6).
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