Have 411.3.4 and/or 714.411.3.4 been considered?

Thought it's not really household and street lighting is excluded from 714.411.3.4.

  - Andy.

1. It’s a proper lamppost so shouldn’t require RCD protection. I really want to know if a Residential Park Home which is sited in a purely residential park should meet 708.415.1.for its fixed connection. I would have said no but it really depends on what is meant by similar locations and why should a residential park be treated different to a mixed one. At some point here they all had 30mA RCDs fitted as to 708.415.1

If the 30 mA RCD protection had not been removed from both the park home and exterior light there would not be an issue with the RCD protection for either of them, but it has so both of them have now need to be considered as potentially having issues.

BS7671 gives a definition of a  Residential Park Home on page 42: A factory produced relocatable dwelling designed for permanent residence which may be used for leisure purposes.

708.415.1 says the supply to a residential park home shall have a double pole 30 mA RCD.

411.3.4 says domestic lighting shall have 30 mA RCD protection.

714.411.3.4 says lighting accessible to the public shall have 30 mA RCD protection.

There isn’t any benefit from having that upstream RCD rated at 100 mA as it is not time delayed and will generally trip at the same time as a downstream 30 mA RCD, so it’s not complying with 531.3.2 any more than having a 30 mA RCD does.

So less protection without any apparent benefits and possible multiple contraventions of the Wiring Regulations.

I’ll let you decide.

Edit- not forgetting 536.4.203 components from different manufacturers, Contactum RCD and Legrand MCBs in an unknown consumer unit.

708.415.1 says the supply to a residential park home shall have a double pole 30 mA RCD.

But only if it's on a caravan/camping park (or similar) (from the scope of section 708) - and the definition of caravan/camping park is something having two or more caravan or tent pitches - which doesn't seem to include this site. (hence the original question)

411.3.4 says domestic lighting shall have 30 mA RCD protection.

But it's not domestic (household) lighting.

714.411.3.4 says lighting accessible to the public shall have 30 mA RCD protection.

But not things falling under part (v) - so not for street lighting.

   - Andy.

As in my earlier reply:

Tom J256 said:

708.1 relates only to the distribution circuits. And it is the distribution and the associated earthing arrangments that I believe is the reason why residential park homes (which are not leisure accomodation or caravans) are in that paragraph that reads: 'In caravan parks , camping parks and similar'.

The similar being the distribution system feeding them. Only my understanding of course

The general body of 7671 applies to the electrical installation within the residential park home and the other considerations are then outlined, as per my first post.

Colin Haggett said:

Does the fixed connection to a Residential Park Home on a static park home site come under regulation 708.415.1 as in does it need a 30mA RCD at the connection point?

Surely this is a question for the particular site owner/operator, as it's their installation?

The Scope of Section 708 of BS 7671, and the requirements in this particular respect, are not unique to the UK, but were made "pan-European" in HD 60364-7-708. I think the scope of Section 708, Regulation 708.1, has been discussed earlier in the thread, and in particular as highlighted below:

The particular requirements contained in this section apply only to circuits intended to supply leisure accommodation vehicles, tents or residential park homes in caravan parks, camping parks and similar locations.

So, the classification of the site as a "caravan park, camping park, or similar location" is really down to either:

• Licensing conditions of any site operating license;
• Planning conditions for the site; or
• Assessment by the operator (where neither of the above apply).

Which is why I said it's really down to the site owner/operator.

The highlighted text suggests temporary occupation of the site, but I don't think that mobile home/static caravan owners can have it both ways. Either they are technically a caravan, even if they are jacked up and the wheels off, in order to gain the advantage of planning laws, or they are not.

However, as Sparkingchip has pointed out, "residential park home" is defined in Part 2.

So if the caravan is in a field with pitches for other caravans, 708 applies. If it is temporary accommodation during a self build, for example, it does not.

An IET Wiring Matters article about the revisions and additions to BS7671 introduced in the 18th Edition:

Requirements for RCD protection have been extended to cover supplies to residential park homes. A final circuit (from the metering point) intended for the fixed connection for a supply to a mobile home or a residential park home shall be individually protected by an RCD having a rated residual operating current not exceeding 30 mA accessible to the consumer. Devices selected shall disconnect all live conductors.

https://electrical.theiet.org/wiring-matters/years/2018/72-september-2018/the-18th-edition-bs-76712018-launch-revisited/#:~:text=A%20fixed%20connection%20for%20a,the%20requirements%20of%20Chapter%2043.&text=Regulation%20708.537.,installed%20in%20each%20distribution%20enclosure.

The IET also consider caravans, mobile homes and park homes to be out of the scope of the Building Regulations including Part P according to this IET Wiring Matters article by the same author, including the double units bolted together on site.

electrical.theiet.org/.../part-p-comes-into-force.pdf

Chris Pearson said:

The highlighted text suggests temporary occupation of the site, but I don't think that mobile home/static caravan owners can have it both ways.

Or 'temporary occupation' of part of the site ... surely it's a "site" issue, not to do with the particular "part of the site" or "what is connected" ?