Outline three IEE regulations regarding electrical earthing.

1. Regulation 411.3.1.1: This regulation states that all exposed-conductive-parts of an installation must be connected to the main earthing terminal by a protective conductor. This ensures that any fault current is safely directed to the earth, preventing electric shock hazards.

2. Regulation 411.3.2.1: This regulation requires that the main earthing terminal of an installation is connected to the earth electrode by a protective conductor. This ensures that the earthing system is effective in dissipating fault currents and providing a low impedance path to earth.

3. Regulation 411.3.2.2: This regulation states that the earthing system must be designed and installed in accordance with relevant standards and regulations to ensure its effectiveness. This includes proper sizing of conductors, correct installation of earth electrodes, and regular testing and maintenance of the earthing system to ensure its continued effectiveness.

1. IEE Regulation 413-02-03: Protective Conductors for Equipment
- Specifies the requirements for protective conductors for electrical equipment, including the size, type, and installation of the conductors.
2. IEE Regulation 413-02-05: Earthing of Equipment
- Specifies the requirements for earthing of electrical equipment, including the methods of earthing, the connections to the earthing system, and the installation of earthing conductors.
3. IEE Regulation 413-02-06: Earthing of Installations
- Specifies the requirements for earthing of electrical installations, including the design and construction of the earthing system, the connections to the earthing system, and the installation of earthing electrodes.