Is your electric fence alarming on one of several fenced enclosures? On a larger site, descriptions such as 'rear fence' or 'farm fence' can mean different things to different people. Use fixed landmarks within the property, an energiser label or an existing plan to explain the line being assessed. Do not enter inaccessible ground or approach electrified wires to obtain measurements for a quotation.
If you recently acquired the property, collect what is available from the seller and label missing information honestly. A service invoice for an animal enclosure, a monitoring agreement and an electric security fence certificate are different records. Keep each with its own system description so later repairs and future transfer enquiries do not inherit the same uncertainty.