By connecting two earth in series

By adding more charcole

By connecting to earth in parallel

By adding more salt

Not less than 22.88 cm

Not less than 18.4 cm

Not less than 15.8 cm

Not less than 10.2 cm

2 M

1-5 M

1 M

0.5 M

1 mm

1.5 mm

2 mm

2.5 mm

To avoid short circuit

To operate easily

To test the supply frequently

To avoid personnal contacts during maintenance