IEEE 16:2004 pdf download IEEE Standard for Electrical and Electronic Control Apparatus on Rail Vehicles
4. Design requirements
4.1 Service conditions All apparatus, including but not limited to electronic apparatus, shall be designed for the standard environmental conditions given in IEEE Std 1478-2001, 18 unless otherwise agreed between the supplier and the authority having jurisdiction.
4.2 Supply voltages
4.2.1 General Equipment shall operate normally or without damage when exposed, for the duration listed in this standard, to any voltage from zero to the maximum value listed in this standard. If necessary, appropriate protection from damage may be provided by other elements of the system in which the equipment is configured (e.g., undervoltage cutout devices). The authority having jurisdiction shall specify the performance expected of the equipment at nominal voltage conditions. At voltages other than nominal, performance shall be as described in this standard unless otherwise agreed to between the supplier and the authority having jurisdiction. In the absence of a specification or agreement to the contrary, the minimum time duration to be considered for “short time” operation shall be taken as 1.0 second for undervoltage operation and 0.2 second for overvoltage operation. Conditions existing for shorter times shall be considered transient conditions governed by 4.3.1.
4.2.2 DC-powered low-voltage control equipment Nominal supply voltages for low-voltage control equipment shall be chosen from the preferred values given in 4.4.3 of IEEE Std 1476-2000. The nominal, minimum operating, and maximum continuous values and the required operating characteristics of the equipment within and outside of these voltage ranges shall be as given in 4.4.3 of IEEE Std 1476-2000. Equipment shall not be damaged by continuous application of voltage between zero and minimum operating. NOTE—These nominal supply voltages correspond to nominal battery voltages of 24, 32, 48, and 64 volts. Refer to IEEE Std 1476-2000 for details.
4.2.3 AC auxiliary apparatus Nominal supply voltages and required continuous and short-time operating voltage ranges for ac auxiliary apparatus shall be chosen from the preferred values given in ANSI C84.1-1995, Table 1, Low Voltage Class. Unless otherwise agreed between the supplier and the authority having jurisdiction, rated performance shall be obtained at the nominal frequency and within the Utilization Voltage limits of Voltage Range A of ANSI C84.1-1995, Table 1. Operation at other frequencies shall be as specified in NEMA MG 1-2003, section 12.45. Operation outside of Voltage Range A but within the Utilization Voltage limits of Voltage Range B of ANSI C84.1-1995, Table 1, shall be as specified by the authority having jurisdiction.
4.2.4 High-voltage dc-powered traction and auxiliary apparatus
Supply voltages for high-voltage dc-powered traction and auxiliary apparatus powered from a dc source (e.g., overhead contact system or third rail) shall be as shown in Table 1. Unless otherwise agreed between the supplier and the authority having jurisdiction, rated performance shall be obtained at the nominal voltage and above, up to the maximum voltage listed in Table 1 for that nominal voltage case. At other voltages, performance shall be in accordance with the design or inherent characteristics of the apparatus.

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