The method of installation requires 30mA RCD protection – e.g. Regulation 415.1 & 522.6.202. Dedicated circuit feeding an immersion heater, conventional oven or cooker, with resistance heating elements. It should be noted that a pass of the EMC standards required for CE marking is a very easy standard to pass, and does not require anything like enough protection to guarantee co-location of equipment. The prescribed levels are set so that you are unlikely to receive or cause trouble from or to the neighbours next door, rather than to prevent self interfernce between bits of kit on the same property, where supposedly you are able to do something about it yourself. To be honest that is even sillier, as there the thing that has to radiate for its correct operation is being screened. This handy RC Unit (residual current unit) has been designed for installing on to any standard 1P or 1P+N Eaton MCB with a 10kA, 15kA & 6kA rating to create an RCBO. The MR30 RC POD unit is ideal for standard applications with a 230-240 VAC voltage rating and 30 mA breaking capacity and is field fitable. Fully compliant with Standard 61009, this capable MR30 POD is utilised in numerous industrial and commercial applications due to its versatility and ease of assembly. is the 100a 30ma RCD a main isolator for the whole of the fuse bord or is it just protecting part in a split-load arrangment.

Add to that the changes that have been imposed on the local supply networks i.e. green energy they have caused a situation that is going to result in frequent surges and transient voltages being produced all the time hence we now need to install surge protection or the likelihood is that if a surge occurs at a property and there is no surge protection then the blame will be passed on to the little man again. The revised RCD guidance in 531.3.3 is precise. The appropriate Type of RCD must be selected, based on the characteristics of the residual current and the equipment that is likely to be connected to the RCD protected circuit". I agree with you on that one, as electricians we have very little control over what will eventually be connected to an installation that we have installed. The initial verification required under 641.1 and 301.1 (ii), covers the requirements for the verification that electrical equipment (any appliance supplied or connected, as part of the existing fixtures and fittings) is compatible with other electrical equipment such as RCDs installed to provide additional protection e.g. for a domestic installation, document the appliance RCD requirements with the justification for the consumer unit specification.

Type AC RCD Risks:

MEM first started manufacturing circuit breakers in 1965 and were one of the UK's biggest names in circuit protection. Now they go under the trade name of Eaton but still use the MEM name on some products. The DC link values of capacitance and voltage, do not result in smooth dc values < 6 mA, being imposed on the AC pulsed wave form. Memera 2000AD – These have a narrow terminal and only fit boards specifically marked Memera 2000AD. They won't fit in older boards. The term general purpose relating to Type AC devices should not be taken out of context i.e. it is the most basic RCD, suitable for detecting a simple full sine wave residual current at 50Hz. Type A Prices: As with any component, normal competitive / market forces apply. A substantial increase in UK demand for a particular product, will normally result in a reduction in unit price, providing the demand does no exceed the availability.

It is more a physical size & shape of fitting onto the Din rail inside the fusebox & if the main live bus-bar has a blade or a fork type fixing to the RCD and each MCB. The method of installation relating to protective earthing will depend on the operational leakage current (protective conductor current) – see 543.7. The use of a 30mA RCD may be required for several reasons; cable installation, location / application area for the pump etc. Take note of 531.3.2 Operational leakage current (protective conductor current) for the circuit should not exceed 30% of the RCD sensitivity. So question one does it pass when tested with a RCD tester? If so what makes you think it is faulty? I am sure the one in my old house was tripping due to surges when a neighbour was welding. Two identical RCD's would hold for 18 months without a problem, then trip for seeming no reason for couple of weeks, then again two years no tripping. So - please help me - have I lost touch with the right places to buy RCDs in the UK? Where can one get a fairly broad selection of different types (A, B) at reasonable price? Why do I find almost entirely AC? The fault current (If) contains mixed frequency components between 10Hz (minimum motor frequency) and 1kHz (maximum inverter switching frequency) ***.Type AC RCDs are in clause 531.3.3 of BS7671 2018, because they are still in EN 60364-5-53 2015. The UK have just adopted this line from the EN standard. For the person who asked about Smartmeter, yes one fitted in last year and quite close to CU (2 meters?). Though similar episode of nuisance tripping preceded its installation and went away of its own. What are you thinking about this? RCD failing to trip when the appliance is running, and the RCD test button is operated, could be an indication that the appliance is affecting the RCD.

What I would say is look at the article as a whole, as it makes it quite clear that 531.3.3 refers to 4 Types of RCD, and the points to consider when selecting RCDs for circuits containing various items of equipment. It also makes the point about consulting the manufacturer of the equipment for advice. I believe the article makes it clear that the their are 4 Types of RCD that may need to be considered - Quote from the article - Memera 2000 – There are several different styles of MCB's in this range but all will fit any Memera 2000 board. Requirement for a transient resistance feature < 3 kA and short 10 ms time delay. **Note: Type A transient resistant RCDs only meet EN 61008/9 for general UK 50Hz residual currents.The older RCD does seem to be affected by spikes, so likely a SPD would stop it, but a consumer unit is a type tested distribution unit, and to retain the type testing only items recommended by the manufacturer can be used, even if they seem to fit. You might ask "Why are Type AC RCDs still referred to in the 18th Edition of BS7671, when most installations should be using Type A devices as a minimum requirement?" Should be neutral - but I accept the motivations of the reader may focus on what is more important to them. For existing installations, problems associated with the following may indicate that Type F is required in place of Type A: The primary principle of an RCD is to protect the persons using the installation, if manufactures are going to be allowed to make equipment that is going to end up in peoples homes then British Standards must make it compulsory for manufactures to state in bold writing how that equipment will affect an installation where RCD's are present, it's already common practice for many manufactures to state what the maximum protective device is to be used with their equipment, so make it their responsibility.

In some other countries in Europe (perhaps not coincidentally the ones commonly using 3-phase supply to homes), it's much easier to find type-A or even type-B.I suspect that many folk would not like to see that during an inspection. What have you earthed it to ? If it is the main switch.. this would involve removing and reconnecting the main incomming supply tails.. Otherwise, I'm not quibbling the need for proper spur to garage, which will separate off two freezers from kitchen, but how do you people feel about this diagnosis? My own insulation tests with mega meter to each unplugged appliance have found no resistance issues, which given he found no wiring issues, leaves no obvious cause except as he thinks maybe too much total freezer earth leakage. Intermittent faults like tripping can send you mad as we all know, is this a good course of action? but mounted above the old Wylex fuse boxes, however done before the rules changed as to electrical equipment in the control of an ordinary person. But still today we have isolators before the CU to comply with HSE rules an live working, so not sure if we can still mount SPD or RCD in separate box before or after main CU?