IEEE C57.12.35-2013 pdf download IEEE Standard Bar Coding for Distribution Transformers and Step-Voltage Regulators
The bar code symbology utilized on the permanent label shall be Code 39, also referred to as Code 3-of-9.in accordance with ANSI/AIM BC1-1995.8
4.2.4 Permanent label printing requirements
4.2.4.1 Bar code symbol print density
The bar code symbol shall be of medium density (four to seven characters per inch (cpi)] with a narrow barwidth of 0.025 cm (0.010 in) to 0038 cm (0.015 in), and a wide-to-narrow ratio of 3:1. The inter-charactergap shall be equal in width to the width of a narrow element.
4.24.2 Quiet zones
Quiet zones no less than 0.64 cm (0.25 in) in length shall immediately precede and follow the bar codesymbol.
4.2.4.3 Dimensions
The height of the bar code symbol shall be no less than 0.61 cm (0.24 in).
4.2.4.4 Interpretation line
A human-readable interpretation of the data included in the bar code shall be printed immediately beneaththe bar code symbol. The height of the interpretation line shall be no less than 0.25 cm (0.10 in).
4.2.5 Permanent bar-code label placement on equipment
The preferred location for the permanent bar-code label, including both the bar-code symbol and itsaccompanying interpretation line, is on the equipment nameplate. As an alternative, the bar-code label maybe placed on a separate nameplate adjacent to the equipment nameplate.
4.2.6 Permanent label quality/durability requirements and tests
4.2.6.1 Requirements
Permanent bar-code label symbols are intended to be readable with commonly available scanningequipment for the required lifetime of the equipment nameplate as defined by IEEE Std C57.12.00.
The readability of the nameplate bar-code label may, however, be affected by the specific scanncrequipment being used and by environmental conditions in which the scanning operation is beingperformed. Users may wish to address these considerations in their specifications. The following durabilitytests described in 4.2.6.2 through 4.2.6.4 shall be performed.