IEC TR 60092-370:2019 gives guidance and lays down the basic recommendations for the selection and installation of shipboard and offshore unit cables intended for electrical systems used in both essential and non-essential analogue or digital signal communication, transmission and control networks, including types suitable for high-frequency signals (i.e. signals with a frequency of more than 105 Hz). These cables are not suitable for direct connection to low impedance supplies. Where such cables are required, attention is drawn to IEC 60092-353. Cables intended to have limited circuit integrity (fire resistance) when affected by fire are not covered by this document. Fibre optical cables are not included. Sub-sea or umbilical cables are not included. This second edition cancels and replaces the first edition published in 2009. This edition constitutes a technical revision. This edition includes the following significant technical change with respect to the previous edition: 30 V AC was added in voltage rating for data cables.