Residential electrical installation - General
From Electrical Installation Guide
Contents |
| Electrical installations for residential premises need a high standard of safety and reliability |
Related standards
Most countries have national regulations and-or standards governing the rules to be strictly observed in the design and realization of electrical installations for residential and similar premises. The relevant international standard is the publication IEC 60364.
The power network
| The power distribution utility connects the LV neutral point to its MV/LV distribution tranformer to earth. All LV installations must be protected by RCDs. All exposed conductive parts must be bonded together and connected to the earth. |
The vast majority of power distribution utilities connect the low voltage neutral point of their MV/LV distribution transformers to earth.
The protection of persons against electric shock therefore depends, in such case, on the principle discussed in chapter F. The measures required depend on whether the TT, TN or IT scheme of earthing is adopted.
RCDs are essential for TT and IT earthed installations. For TN installations, high speed overcurrent devices or RCDs may provide protection against direct contact of the electrical circuits. To extend the protection to flexible leads beyond the fixed socket outlets and to ensure protection against fires of electrical origin RCDs shall be installed.
