| No main earth cable | Code 1 |
| Main earth cable undersized | Code 1 |
| No main equipotential bonding cable to main gas meter | Code 1 |
| Main equipotential bonding cable to main gas meter undersized | Code 1 |
| No main equipotential bonding cable to main water stopcock | Code 1 |
| Main equipotential bonding cable to main water stopcock undersized | Code 1 |
| No supplementary bonding cables visible in the bathroom / shower room (special location) | Code 1 |
| Supplementary bonding cables undersized | Code 1 |
| MET (Main Earth Terminal) not labelled | Code 2 |
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| Main Earthing Conductor | The earth cable that comes from the supply (mains head) to the consumer unit (fuseboard) main earth terminal.
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| MET (Main Earth Terminal) | The main earthing conductor is first connected from the mains supply.
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| Main Equipotential Bonding Conductors | These earth cables run from the main earth bar to within 600mm of the main gas and water stopcocks. It is not always practical to achieve this as sometimes the meters are externally situated or there is no main water stopcock within the premises, In this scenario the pipes can be bonded at the closest point of entry into the premises.
|
| CPC (Circuit Protective Conductors) | These earth cables run from the main earth bar to accessories such as socket outlets, switches, lighting points, metal back boxes etc.
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| Supplementary Equipotential Bonding Conductors | These earth cables interconnect all electrical circuits and pipe works situated within the bathroom / shower room.
|
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