Embossed metal tags are used to identify cables throughout the vessel. The tags are located at the distribution panel and the component.
Tags are also attached to the cables where penetration of the bulkhead is necessary. The tag code will start with the type of circuit it is.
Vessels use P to indicate power distribution panel cables, L for lighting distribution panel cables, and E for emergency distribution cables.
If there is a number preceding that letter, this identifies the cable in the distribution panel. The next numbers indicate the voltage carried in that cable, such as 400 or 200. Any additional numbers above the whole hundred value are used to distinguish the differences between two like voltage distribution panels.
For example, in the ship cable tag 3P-401
3 indicates the third wire in distribution panel P-401.
P indicates that this cable acts as a power-supplying cable or that it provides three-phase AC to its loads.
An L would indicate a lighting or single-phase AC supply panel cable.
4 with two additional digits means that there is 400 to 499 volts in that cable..
If there was only one additional digit, then the voltage in the cable would be what is actually printed. For example, 24 indicates 24 volts.
01 distinguishes the cable’s source.
This identifies the difference between the P-401 distribution panel and the P-400 distribution panel.