Can't find a link but here is the NCCL Guide
Guide to Periodic Inspection and Reporting of Electrical Installations in Touring Caravans & Motorhomes
Summary
This Guide relates to the Periodic Inspection and Reporting (PIR) of electrical installations in Touring Caravans and Motorhomes. Throughout this Guide the term caravan is used to refer to both.
In the view of many electrical experts, a PIR is vital to ensure continued electrical safety for all caravan installations. In the UK, when a new caravan is built, the electrical installation is inspected and tested and a certificate is issued to verify that the installation meets the current safety requirements. However, over time, an electrical installation is likely to deteriorate due to damage, wear and tear, corrosion and environmental effects. So, a Periodic Inspection and Report is needed to ensure that the electrical installation in a caravan remains safe.
A Periodic Inspection and Report is also required for caravans to comply with BS 7671: 2008 (the 17th Edition of the IEE Wiring Regulations). To ensure continued safety of a caravan’s electrical installation and hook-up cable, it should comply with the requirements of BS 7671. Chapter 62 of BS 7671 details the scope, extent and frequency of the Periodic Inspection.
Content
The guide has three separate sections containing advice to NCC members:
1. Dealers
2. Workshops
3. Touring park operators
1. Dealers
The NCC recommends that each time a used caravan is sold commercially an inspection is carried out and a PIR is issued. This will ensure that the vehicle leaves the dealership in a safe condition with respect to the electrical installation and will satisfy any legal obligation for the supply of goods under the Consumer Protection Act 1987 and the European Product Liability Directive 85/374/EEC.
When a unit is sold on an ‘as seen’ basis, a disclaimer could be issued along the following lines: The electrical installation in this caravan/motorhome has not recently been inspected to the requirements of BS 7671 and may not be safe to connect to the UK electricity supply.
2. Workshops
The NCC expects all AWS and dealer workshops to offer PIRs. A workshop can offer a PIR as part of an annual habitation service or as a stand alone service. However, it is the owner’s choice to have a PIR done: there is no reason to suspect that Touring Parks will be routinely asking to see a PIR before a caravan is connected to the supply (see below). If the customer chooses not to have a PIR then you can ask them to sign a PIR waiver form. A copy of the waiver form can be obtained through the NCC. The waiver provides a record that a PIR has been offered by the workshop and declined by the customer.
Frequency of the Inspection
The Institution of Engineering and Technology (IET, see note 1) publication “Guidance Note 3 Inspection and Testing” recommends the maximum period between inspection and testing for caravans should not exceed 3 years.
In practice this period is decided by the engineer inspecting the caravan: he will recommend the date of the next inspection based on the use and condition of the electrical installation and enter this in the report. If the installation is showing signs of deterioration, due to external influences such as damp or areas of non-compliance in the electrical installation, the term may be reduced to 1 year. It can also be reduced if the caravan is used frequently or if there is an increase in mileage, but again this will be decided by the engineer.
In the majority of cases the period between inspections should be 3 years.
Manufacturers will now be issuing electrical installation certificates for new caravans recommending an initial interval of 3 years before the next inspection (i.e. the first PIR).
3. Touring Park Operators
There are no regulations in place that require you to check the documentation of a client’s caravan before connecting it. However, to maintain a reliable supply, it’s in the best interests of a park operator to ensure that all caravans connected to the supply are electrically safe. But you will not know if there is anything wrong with a caravan’s electrics until after a problem occurs. Therefore, if you have any doubt about the safety of a caravan’s electrical installation, we recommend that you ask to see a copy of the Electrical Installation Certificate or the most recent PIR if the caravan is more than 3 years old.
Note 1
The IET was formerly known as the IEE, the name used in publications and on documentation such as certificates and reports will differ depending on the date of publication.