Pad Mounted Transformer
A transformer that is mounted on a pad (usually concrete or polycrete) that is used for underground service. Pad mounted transformers are available in single phase and three phase configurations.
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OSI 7-layer model
The Open System Interconnection 7-layer model is a model developed by ISO for modeling of a communications network.
OSHA 29 CFR 1910, Subpart S-Electrical
Occupational Safety and Health Standards. Section 1910 Subpart S-Electrical Standard number 1910.333 specifically addresses Standards for Work Practices.
Open-Circuit Voltage (Battery)
The voltage of a cell or battery when it is not delivering or receiving power.
Output common mode interface voltage
An unwanted alternating voltage which exists between each of the output terminals and a reference point.