METER TAILS LONGER THAN 3 METRES- Switch fuse isolators from LEWDEN

If you are installing electrical meter tails longer than 3 meters long, you'll need to install a meter tail switch fuse. We explore two of the most popular options from Lewden.

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Products featured
Lewden MSF (main switch fuse)
Lewden 100A DP Switch fuse metal
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Article discussing long meter tails from Professional Electrician by Paul Chaffers NAPIT
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🕐 TIME STAMPS 🕕
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00:00 Electricity meter tails longer than 3 meters
01:00 Or is it 2 meters? - ask your DNO
01:43 Plastic isolator for use inside a meter box - Lewden MSF
03:50 Option for use with Twin and Earth
04:40 Protection for longer meter tails
05:50 Switch fuse isolator for use with SWA cables
06:20 Supplied with 60, 80 & 100A fuses
07:40 Alternative cable entry option
08:50 Generous terminal sizes
09:18 The all-important torque settings
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📹 Presented by
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#efixx #electricians #lewden

[iandonnelly]

I've installed a few of these in meter cupboards to comply with the 3m rule when doing board changes. Absolutely wonderful bit of kit, hugely flexible design.

[derekwallace]

That was very informative as we live in a flat complex of 24 flats where the meters are located in a central location with these types of isolators installed. Thanks.

[minitom]

I used to fit the meters on new builds and used all of these as well as the standard Wyler double pole isolator. My only tip would be if the sparks on site are fitting their own isolator so they can run SWA which is becoming more common, let the meter guy know or fit it prior to him/her coming and they can fit tails straight into it. This avoids the scenario of having to squeeze 2 double pole isolators in the box which ends up happening frequently

[jamiekent]

Hi do you use the same size fuse as what the DNO has supplied in the head or down grade the supply to the next size fuse rating for discriminating purposes??

[christopherrooney]

I am so glad to see this Video I am have this issue on a new build. Where the contractor who did the original install is saying there is no regulations to state that the meter tails should not be only three meters long stating the NICEIC are happy with this. I am also a NICEIC contractor I have challenged this with the relevant regulations. The tails they have installed is 7 meters long and run thought the property.

[CommonInvesting]

at 4:15 love how the video sorta re sets where he had to find out what the cable duct was referred to as (I assume) haha. great video as always. thanks

[jamesbrooks]

Great video as always, shame 90% of new builds have tails longer than 3m which are being signed off.

[acespark]

The smaller switch fuse I have used before and I do like the one in the enclosure, BUT Lewden could have made the enclosure just a bit taller so you don't have to fight the cable in to it

[Cjrelectrical]

Love the lewden switch fuse best on the market

[johnstancliff]

I really like the heavier duty version. that would be my pick if I was planning a electrical job. 100A main.... thats enough for any new home... here in the US, we have 100, 200, and even 400 Amp mains for the homes here... when you have a huge home with a detached garage, or even a shop.... 400 amp is the way to go here.... love the video! thanks guys!

[dannymort]

Great video. With relation to a hrc fuse in isolator for consumer tails >2-3 meters for fault protection will the dno fuse not operate in any case if there is a fault as the pre arcing on the isolator fuse is not likely to be less than the let through energy of the dno fuse

[huyongquan]

According to OSG B5, 100A 1361-2 cut out fuse will operate when Zs low than 0.26 ohms( Cold meter tails measured @ 10 census and hot cut out upstream? not sure, why use correct factor, just small length meter tail cold), would you mind explain why DNO still keep 0.35 ohms limitation on TN-C-S. does this arrangement will make 100A cut out 1361-2 fuse operate when earth fault even short circuit?

[obdHsN]

4:08 - if this is mounted inside the meter cabinet, then would the "cable duct" still be required to attach to twin & earth? Obviously this would look rough, but from a regs point of view it should be OK, shouldn't it?

[jgharston]

One of my first jobs in the early 1990s after getting my diploma was rewiring a couple of flats, with the "at a distance from meter" problem. Nothing like it was covered in my course, so I went back to first principles and worked out everything from scratch. Overcurrent/Isolator must be within 3m of meter, downstream then sized to route to the CU in the flats. "I want that unsightly cable plastered in" No, because then it's not protected, and will have to be armoured and cost XXX hundreds extra!

[richardwallace]

I’ve used this lewdon switch-fuse with tails in and out and positioned it outside the meter box (meter box being inside the house). Also used the method of putting unearthed 4mm steel strip in front of the tails for protection all the way to the fusebox. Very happy with outcome.

[jwheeler]

The Wilex DSF80 & DSF80M are great. “M” at the end for metal is like bigger one here, and the non metal one is like a much better version of the little one but is much harder to source stock of. Ps. 80 in the model number for 80A, but they also do 60A, 100A and unfused versions.

[Dog-whisperer]

Fantastic video guy’s as always very interesting. 👍👍👍❤️⚡️

[avfczoff]

What about existing 16mm twin & earth in a property that has been installed through different floors? Is there a device that has RCD protection as well as a fuse?

[NicolasRaimo]

I have the 2nd solution and it’s where it shouldn’t be ;) but no where else for it to go as it’s straight out to my armoured cable going my garage

[davida]

How are you satisfying IP4X on the top entry of the smaller switch fuse?
Are you just saying it’s in the meter cupboard? Therefore in a lockable cover?