Typical code letters include Q for circuit breakers, T for transformers, A for assemblies (switchboards), etc. There are specified in more detail in IEC 60617 for each type of device. Generally we number each product in ...
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High-voltage distribution box number code - GDR Telecom Site Energy Systems [PDF]
The relay logic will monitor the current as well as breaker status and if the breaker fails to operate after the time expires, relay will trip and lockout all the other 34.5kV circuit breakers as well as the high
Each panelboard is considered a main and takes the number switchgear appended by the feeder number and a sequential letter (e.g., A, B, C); in this case, 65A1A and 65A1B.
When one device performs several protective functions, it is typically denoted "11" by the standard as a "Multifunction Device", but ANSI Device Numbers are still used in documentation like single-line
This code is part of the latest version of Uniclass. Products v1.42, April 2026. Still need help? Browse the full set of Uniclass tables, delivered, managed and maintained by NBS.
This engineering article defines the numbering system used for the design of low voltage (LV) (i.e., below 690 Volts a.c.) and high voltage (HV) (i.e., up to 150 kV a.c.) installations.
Boards, cabinets and similar combinations of apparatus for electric control or the distribution of electricity, for a voltage > 1.000 V but <= 72,5 kV
ANSI Standard Device Numbers & Common Acronyms ANSI Standard Device Numbers & Common Acronyms
View the TI High-voltage power distribution box block diagram, product recommendations, reference designs and start designing.
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If the expected operating voltage is greater than the value given below, the clearances in this bulletin may be inadequate. Refer to the 2012 edition of the NESC for guidance.