Important note :This essay should be for non engineers readers.

Thises statements: The benefits of using either underground cable and overhead transmission lines depend on ; the efficiency, the cost and the safety .

Outline :
1-Transmission efficiency :
1.1 whole system realibalty and power losses.

2-The cost :
2.1 Initial cost construction.
2.2 Maintenence cost :
2.2.1 Problems.
2.2.2 Solution .

3-The safety :
3.1 Health hazereds .
3.2 workers safety

Important note :This essay should be for non engineers readers.

Thises statements: The benefits of using either underground cable and overhead transmission lines depend on ; the efficiency, the cost and the safety .

Outline :
1-Transmission efficiency :
1.1 whole system realibalty and power losses.

2-The cost :
2.1 Initial cost construction.
2.2 Maintenence cost :
2.2.1 Problems.
2.2.2 Solution .

3-The safety :
3.1 Health hazereds .
3.2 workers safety