Understand the difference.

Compare the meaning, drawing context and source references of two entries. A similar graphic or shared abbreviation does not establish equivalence.

UGC

IEC

Underground cable

The underground cable form marks a circuit section that is buried, either directly in soil or in buried ducts. Network diagrams use it to separate cable sections from overhead sections, since cables have higher capacitance, lower reactance and are generally not suited to repeated auto-reclose onto a fault.

Drawing use

SLD / GA

Application

Connections & wiring

Reference family

IEC

Form evidence

Underground cable route form. Independent IEC-context illustration; not certified IEC geometry.

A distinction that matters

An underground cable is buried; a conductor in conduit may be above ground and carries different derating.

Full referenceAdd to legend

OHL

IEC

Overhead line

The overhead line form identifies a circuit section strung in air between supports. On network single-line diagrams it distinguishes overhead feeders from underground cable sections, which matters because the two have different impedance, fault behaviour, auto-reclose practice and lightning exposure.

Drawing use

SLD / GA

Application

Connections & wiring

Reference family

IEC

Form evidence

Overhead line route form. Independent IEC-context illustration; not certified IEC geometry.

A distinction that matters

An overhead line is strung in air; an underground cable is buried and has very different capacitance and fault characteristics.

Full referenceAdd to legend

Original educational previews. Follow the source references on each full entry for the appropriate standard or selected product.