Frequently asked questions

A 63A MCB is not offered in our range as the demand for it does not warrant us offering it, you can use a TPN Board with (TPN-SPL) SPL link for our 10KA range.

Yes you can, as long as the correct type of fuse is selected, which can be source from a reputable wholesaler.

The surge device should be fitted into a TPN-EXT19 which can be fitted above or below our TPN board and then fed from a 3pole MCB from the board.

We are in development of a product but you can use 2 off 5MODMC’s stacked on top of each other with M25 and M32 conduit fittings between, and then fit the SRG3V1G in one enclosure then the E10-3C32 in the other.

No but if you use our unpopulated dual RCBO board (QFS-MX12/16/20XXM) then another main switch (GMS1002P) can be fitted on the left and the flexible cables supplied can be reconfigured to suit. A new main switch label is supplied in the sticker pack with the consumer unit. Please note that the new main switch won’t have a round knockout inline top or bottom of it.

The E-TPN-04/08/12/16LW range is set up for 10Ka fault current MCB/RCBO devices. The breaker you have may be a 6Ka domestic type so a conversion kit can be brought separately E-TPNZB04/08/12/16. The fault current for the installation must be known before fitting domestic breakers. Please note that we do not offer 3 pole MCB’s in 6Ka so if a 3 phase breaker is required the whole board must be kept as 10Ka.

No but a 3 pole MCB can be fitted in the TPN board then a 4 pole RCD can be fitted into the TPN-EXT19 above or below the board to give the same level of protection.

Our current G06 range will be compatible as long as 3mm is cut off the end of the comb busbar.

The original LEB breakers are now obsolete but we do have some old stock still available, please call our sales team for current availability. Our current E10 range is not a replacement. Try “B” and “D” curve instead of “C” if suitable for the application. If a single pole MCB is required then our G06 range will fit but are only 6Ka rated while the LEB’s are 10Ka. The fault current of the system should be measured to see if suitable before fitting.

Lewden now own CGD and we do not have any problems fitting these two different brands in one consumer unit.

No but please call our technical team to discuss your matter and we will endeavour to do their best to help out.

Yes our domestic RCBO’s (RCBO-16/30/SP) are compatible with the LEB breakers but are only 6Ka rated while the LEB’s are 10Ka. The fault current of the system should be measured to see if suitable before fitting.

More than likely it is wired up incorrectly. The live and neutral supply to the unit is purely to energise the clock, a separate live needs to be connected to the switching side to provide a switched live output. Imagine the switch contacts like a standard 1 gang 2 way light switch on the wall.

Yes our dual RCCB/split load boards are all supplied with this link which can supply 2 modules next to the main switch. The high integrity link is for critical circuits such as smoke alarms, burglar alarms and also surge protectors so they operate regardless of the RCCB’s being on or off.

No our 2 pole RCCB/RCD’s can be wired with the line or load in the top or bottom and or with the live/neutral in the left/right terminals. The 4 pole RCCB’RCD’s can also be wired with the line or load in the top or bottom.

Yes the part number is RCD10-63/30/2ALV. RCD’s are voltage dependant due to the tripping coil inside rather like getting the correct voltage for a relay or contactor.

No this board is only to be used as an accessory to our TPN boards for fitting a surge device, time clocks, contactors and RCD’s. It does not contain an earth/neutral bar or a top plate as these are done in the TPN board.

We do not specifically offer spreader boxes but if you use the same size enclosure from our WME enclosure range then it can be turned upside down then both gland plates can be removed so the large cable can go through this opening. The door on the extra box can be swapped around so it hinges from the same side.

Yes we offer these on our special build service where we utilise a GRP enclosure, please call our technical team for a quotation.

As this is not a mandatory requirement for the current wiring regulations we are not currently offering a device. We are currently exploring this technology as it is still evolving at a great pace and comes in different forms.

To eliminate the building wiring being at fault please disconnect completely the load side and re-test in isolation, check your device is testing the correct class or RCD and replace the batteries. If you have a number of units failing there has got to be something else wrong. Any more problems please call our technical for further help.

There is no mention of being able to lock in the on or off position in any standards, obviously locking in the off position is no problem but being able to lock in the on position is an extra feature that is used for critical equipment.

Yes it has the 24VAC output required. 4VAC and 16VAC can be derived from the BT too by using the 2nd and 3rd terminal for 4VAC and between terminals 2 and 4 for 16VAC.

These are two completely different water ingress protection tests; the incremental digits usually cover all of the tests below it but when the second digit goes above 6 they are separate tests. So IP66 is totally sealed against dust and protected against crashing waves while IP67 is totally sealed against dust and protected against temporary immersion under water. Most Lewden products denote IP66/67 so they comply with both tests.

As 63A and 125A units as less common they are only offered in the higher ingress protection.

RCD’s are only offered in 25A, 40A, 63A and 100A ratings so the rating above is often used. A 16A outlet would have 25A fitted and 32A would have 40A. An RCD does not offer any overload protection so the current rating is purely the maximum current it will handle without failing so the socket outlet must have a suitable rated MCB fitted upstream.

This is called a pilot pin which is used to give feedback that the connection has been made. This can turn on a contactor so the power is switched off prior and on when connected to avoid arcing, it is also used for earth monitoring purposes too, so if the earth is lost on the appliance the socket is disconnected with a contactor. All of Lewden/Palazzoli 63A and 125A plugs and sockets are come with the extra pin as standard which is not counted when specifying the number of pins.

Yes, but not all other brands of RCD’s test switches might not operate; this is due to the wiring of the test resistor inside being wired between phase and neutral or phase and phase. All of Lewden’ s 4 pole devices test resistors are connected between phase and phase so will work without a neutral.