Aluminum strand belongs to bare conductor

At present, Aluminum-clad steel strand (LGJ) is widely used as conductor in China; steel core mainly plays the role of increasing strength, and Aluminum strand mainly plays the role of transmitting electric energy. The cross-sectional area of the conductor varies according to the voltage. For example, the current domestic 500 kilovolt transmission lines are generally LGJ-400/35 conductors. L is the abbreviation of aluminium wire, G is the abbreviation of steel core, J is the abbreviation of stranded wire, 400 is aluminium 400 square millimeter, 35 is steel 35 square millimeter.
1 Types of aluminium strands and steel-cored aluminium strands as shown in Table 1

Table 1 Model and Name:

Model	Name
LJ	Aluminum strand
LGJ	Steel-cored aluminium strand
LGJF	Corrosion-resistant steel-cored aluminium strand

2.2 Representation
The product is indicated by model, specification and the number of this standard.
For example, an aluminium strand with a nominal cross section of 240mm2 is expressed as:
LJ-240GB1179-83
The nominal cross section is 300mm2 aluminium.
The steel-cored aluminium strand of steel 50mm2 is expressed as:
LGJ-300/50GB1179-83
Specifications
Specifications are expressed by nominal cross sections.
The specifications of aluminium strands shall conform to Table 2.
Specifications of steel-cored aluminium strands and anticorrosive steel-cored aluminium strands shall conform to