Công cụ tính nối đất và liên kết đẳng thế

How this is calculated#

The tool sizes the protective earthing conductor, the main earthing conductor and the bonding conductor. It reads AS/NZS 3000:2018. It starts from the size of the active conductor.

1. Protective earthing conductor. You enter the active size and the conductor material. The tool reads the earth size from Table 5.1.
2. Main earthing conductor. The tool reads Cl 5.3.3.2. It sizes the conductor from the consumer mains size you enter.
3. Bonding conductor. You pick the bonding case. The tool reads the bonding conductor size from Cl 5.6.3.2.
4. Adiabatic check. If you turn it on, you enter the fault current and clearing time. The tool then checks the selected conductor against the adiabatic equation. A larger size replaces the table size if it fails.

Worked example#

• 16 mm² copper active conductors. Consumer mains are also 16 mm², with the general bonding case. The protective earthing conductor is 6 mm². The main earthing conductor is 6 mm². The bonding conductor is 4 mm².

Limits#

The table sizes cover the usual installation. The tool does not cover a special case. A long earth route can need a larger conductor for loop impedance. Use the loop impedance tool for that.

The tool does not choose the earth electrode or the earthing system. It does not check the conduit or cable support. The adiabatic check is off until you turn it on.

See also: The MEN system, Short-circuit withstand and the k factor and the fault rating tool.