Mem EATON 100 AMP 30mA DOUBLE POLE RCCB RCD A100HE

Product Information

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. 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. High frequency current components can saturate the RCD, preventing detection of 50Hz residual currents. In your own words - It is not appropriate electrotechnical language, its generic and anyone following that as a lead will not carry out an appropriate assessment.

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 - 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. 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. Single-phase inverter designs, applied in washing machines and handheld appliances, containing variable speed features, may produce mixed frequency leakage currents. Appliances containing inverters and motors, can be used with Type A RCDs, if: To be honest that is even sillier, as there the thing that has to radiate for its correct operation is being screened.

You are right assuming as long as the electical characteristic match it will perform the same function.. Type F RCDs cannot provide protection in circuits where there is a requirement to detect smooth DC residual currents, or if the motor frequency can be reduced to zero or the inverter switching frequency is >1kHz. If any of the above conditions apply, Type B RCDs must be used. The DC link values of capacitance and voltage, do not result in smooth dc values < 10 mA, being imposed on the AC pulsed wave form. This is explained in Chapter 12, 13 and Chapter 30. The Electrician is responsible, not the Technical committee, to make the decision on which device is appropriate for the installation. Interesting Comments you are entitled to your view, but I am not sure about your motivations - as the article does not say that you cannot use Type AC RCDs.

If you’re not sure about quantities, sizes or have any other questions about your electrical wholesale products, our Electrical2Go sales team will be more than happy to help. Give them a call now on 01424 220384. KEY FEATURESMemera 2000 – There are several different styles of MCB's in this range but all will fit any Memera 2000 board. 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.

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". There's never going to be a perfect solution but there does need to be a less complex solution than there is. UK electricians can still make informed technical decisions. This is explained in Chapter 12, 13 and Chapter 30. The Electrician is responsible, not the Technical committee, to make the decision on which device is appropriate for the installation. 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. and the RCD should be selected based on the characteristics of the connected loads. Should be neutral - but I accept the motivations of the reader may focus on what is more important to them.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? 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?" A well-timed subject. Just a few weeks ago I tried to find a new RCD to replace an old BS4293 one. I have seen how a pure type-AC RCDs rated for 30 mA trip can allow multiple amps of half-wave-rectified current without tripping. As this is a TT installation where earth fault protection depends on the RCD, it feels very inappropriate to have anything less than a type-A, given that plenty of loads contain rectifiers. (Admittedly, the old one was presumably only like type-AC, but that's not an excuse.) I suspect that many folk would not like to see that during an inspection. What have you earthed it to ? 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?

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. 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 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. 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. Type AC RCDs subjected to pulsed waveforms will not trip within the safe limits, required for 30mA protection. Appliances containing diodes, produce pulsed residual currents – see Fig 1. Diodes became so common in domestic equipment some years ago, that many countries banned the "general use" of Type AC RCDs e.g. From 1985, VOE Regulations specified the use of Type A RCDs in all domestic installations as a minimum requirement.

Type AC RCD application example:

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. 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. Circuit feeding a single-phase micro-wave oven with inverter-controlled output to the magnetron. A fault on the output side of the bridge rectifier will produce a pulsed fault current (If fig 1), generated at the supply frequency. For applications using single phase inverters for speed control (washing machines, GSHPs etc ), the design characteristics of a single-phase inverter will determine if it is safe to use Type A RCDs upstream.