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meters

The metre (Commonwealth spelling) or meter (American spelling; see spelling differences) (from the French unit mètre, from the Greek noun μέτρον, "measure") is the base unit of length in the International System of Units (SI). The SI unit symbol is m.
The metre is currently defined as the length of the path travelled by light in a vacuum in 1/299 792 458 of a second.
The metre was originally defined in 1793 as one ten-millionth of the distance from the equator to the North Pole along a great circle, so the Earth's circumference is approximately 40000 km. In 1799, the metre was redefined in terms of a prototype metre bar (the actual bar used was changed in 1889). In 1960, the metre was redefined in terms of a certain number of wavelengths of a certain emission line of krypton-86. The current definition was adopted in 1983 and modified slightly in 2002 to clarify that the metre is a measure of proper length.

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  1. gmartine

    Anybody been asked to tamper/slow or bypass meters?

    Extremely small sample (150) conducted by an insurance company would you believe... https://news.sky.com/story/ticking-time-bomb-over-widespread-meter-tampering-during-cost-of-living-crisis-12897023
  2. G

    No water in several of my flow meters

    Hi, I have bought a house that has Uponoor water underfloor heating. It was running ok but the recent cold snap has resulted in me being unable to get my rooms warm enough despite the boiler churning through plenty of gas. A little googling and poking around with a torch reveals that there may...
  3. W

    Convert central heating with 1 meter into separate controls & meters

    Would it be a big job? Would floorboards have to be taken up etc? How long would it take? Each unit is a single-person flat. Would tenants have to move while it's done, or could it be done in a short time...say within a day? It's an old building - heating is from 70s or 80s. The type of heating...
  4. david_navigator

    Replace 2 meters with 1

    Back in the eons of time, we used to have a massive gas boiler (feeding the house via about 2 inch steel pipes). This was fed by a large commercial meter (G16 ?). About 15 years ago, we replaced the boiler with 3 x 30kW Combination boilers and split the supply in to two G4 meters. The reason...
  5. L

    Black flow meters on new CH system

    Hi Is it normal to have very black UFH flow meters on a relatively new manifold (see image)? (Note the two clear flow meters on the LHS are for circuits which are not yet operational, so no water flow through them as yet.) Background is that I have an unvented system boiler CH system...
    • LE4R
    • Thread
    • america black flow flow meter meters new system underfloor heating usa
    • Replies: 10
    • Forum: USA
  6. B

    Electrical meters in Unit block - With new Plumbing

    hello - I am curious if there is a plumbing standard or electrical standard that applies. Situation is unit block, old 50's apartment - 10+ electrical meters in wire cage together. Someone has put forward a bylaw change that will allow them to run kitchen piping in body corporate areas that will...
    • Beccaa
    • Thread
    • america block electrical meters metres new plumbing usa water issue
    • Replies: 0
    • Forum: USA
  7. M

    Accuracy of smart meters?

    I've just had to take over the affairs of my late brother and I'm looking at his gas bill - the house has a smart meter and he's used more in July (he was single) than we do and there's 4 adults in our house. The bill suggests the readings are "actual" readings - so how would this be in the...
  8. A

    Polypipe UFH Flow meters - does anyone know the measuring scale?

    Hi all. I have a Polypipe UFH manifold with flow meters for each circuit. I’ve worked out the pipe length and know what flow rate to achieve BUT the flow meters do not have any scale. All I have is min (top) and max (bottom) and nothing in between! The Polypipe product code is PB129FM for the...
    • Amarka
    • Thread
    • anyone flow measuring meters polypipe scale ufh
    • Replies: 4
    • Forum: DIY Plumbing Forum
  9. D

    2 Meters Convert to 1 Smart Meter

    Hi, Currently We have 2 meters and each meter is connected to 2 CU. We are looking to upgrade to a smart meter. At the moment OVO have no slots for my area however, when I do get a slot they will replace 1 of the meters and remove the other they bit I'm not sure about is how will the 2nd CU...
  10. S

    Training to fit smart meters (met 1)

    Hi guys, Just a quick question, can a company train you from scratch just to fit smart meters (met1) ? or would you need to train for a ccn1 qualification first/along side? I was under the impression you would need your ccn1 to be registered gas safe ? Thank you in advance Kind regards Steve.
  11. finchy01

    What tolerance is allowed on smart meters

    Morning all, I'm just about to head out to a leak where the TOFOs have been after fitting a smart meter. Just had a thought, I assume the tolerances with appliances connected are still the same as normal. That sounds like a stupid question but I just wanted to double check incase it fits this...
  12. Joshua

    Plumbing science question about meters head and bar

    First I'll give my understanding on how I think it works, haha bear with me people. Say if I had a simple combination system and I wanted to make sure the boiler can heat my radiators across a flat that has an area of 50m2. The height of the flat is about 10m high. Would about 1-1.5 bar suffice...
  13. M

    Domestic water meters?

    hi chaps. Are the new internal water meters tamper proof? I'm sure I've heard it from someone but can't quite recall.
  14. R

    Three lovely gas meters to cheer people up

    Lovely and tidy... Photo of a photo I took, apologies if the image quality is lacking... Ric
  15. sammathias

    TB FOR GAS RATING SMART METERS?

    just after a link to the tb for gas rsting these new smart meters. Did have a paper copy but mispaced it. Cheers.
  16. D

    How to Gas Rate Smart Meters

    hi all. Hopefully someone can help I did see something in gas installers mag last year and lost it. How do I gas rate smart meters. Specifically the 'Secure' ones used by 'OVO'. TIA
  17. cr0ft

    Capping off large gas meters

    Folks, Went to a job today to cap off a very large gas meter. Didn't quote for it as the pipe coming out was 2.5" LCS and I wouldn't have a clue where to get caps for the meter. They just want the gas supply disconnecting and the meter capped off. Can you do this on a domestic ticket or does...
  18. M

    Underfloor Heating Flow Meters

    Hi, I have had wet underfloor heating installed in a pair of new build semi's. The problem i have is that i have 1 thermostat controlling 2 zones in kitchen/diner (1x100 metres 1x50 metres pipe run) & another thermostat controlling lounge (1x100metres). I have tried balancing the flow meters...
  19. T

    4 meters waste pipe under concrete floor?

    Want to pick your brains. Having a extension done on the kitchen and wife wants to swap the living room and kitchen around so that living room faces the garden. Soil stack currently in corner of kitchen and can't be moved as all services are at rear of house. From the soil stack to where the...
  20. G

    Actavo vs Amey

    Hi guysi have been offered a smart meter job with Actavo. I have also interviewed with AMEY and was just wondering if you had to choose between the 2 which would you choose? Has anyone heard anything from anyone working for either company? Thanks in advance.
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