ProDave Posted May 30, 2016 Share Posted May 30, 2016 This thread was originally posted in the other place, and is a team effort to collect together as many acronyms and abbreviations used in the building trade as we could. If you know of any abbreviations missing, or think there should be a correction to the list, then post them as a reply to this topic and one of the moderators can edit the original list to keep it all up together. AAV = Air Admittance Valve. (Sometimes referred to as a Durgo Valve.) AAV (alternative) = Automatic Air Vent. ACH = Air Change [per] Hour AIUI = "As I understand It". AONB = Area [of] Outstanding Natural Beauty Article 4 Direction = Removes Permitted Development (PD) rights. (See: http://www.brighton-...cle-4-direction ) ASHP = Air Source Heat Pump (And see also: http://www.planningp...ects/heatpumps/ ) BC / BCO / BI = Building Control / Building Control Officer / Building Inspector (Often prefixed with LA = Local Authority, as in LABCO.) BR = Building Regulations (Regs) CIL = Community Infrastructure Levy (= a charge levied by a LA based on the sq.m of a property. Note: self-builds are exempt.) CO = Conservation Officer. (Now often designated: Heritage Officers. Specialized - although often not particularly qualified - planning officers working in a local authority Conservation/Heritage department. Have the power to over-rule BC where the Regs are concerned if a proposal is considered likely to impact on the "historic character" of a building, whether Listed or not, or in a Conservation Area.) {Listed Building, see: http://www.planningp...ing_consent.pdf } {Conservation Area, see: http://www.planningp...ns/conservation } CU = Consumer Unit CCU = Cooker Connection Unit CWS = Cold Water Storage [tank]. (Large plastic tank often in attic.) CYL Stat = hot water cylinder thermostat for control of DHW temperature. DeltaT = ΔT (Greek symbol Δ =delta in Greek alphabet) Temperature difference. (In the building context usually referring to the difference in temperature across a wall when discussing the effectiveness of insulation.) DG = Double Glazing (Sometimes referred to in shorthand as 2g = double glazed; 3g = triple glazed. Also expressed as 'd/g') DCW = Domestic Cold Water DHW = Domestic Hot Water DNO = Distribution Network Operator (electricity supply) DPC = Damp Proof Course DPM = Damp Proof Membrane EA = Environment Agency EDPM = Roofing membrane. (EPDM rubber (ethylene propylene diene monomer (M-class) rubber), a type of synthetic rubber,) EPC = Energy Performance Certificate (See: https://www.gov.uk/b...ce-certificates ) EPS = Expanded Polystyrene Insulation EV - Expansion Vessel EWI = External Wall Insulation F&E = Feed and Expansion tank. (Small plastic tank often found in attic alongside CWS.) FCU = Fused Connection Unit FWIW = "for what its worth". (As in: "That's my opinion FWIW.") FYI = For Your Information. (Now often seen in formal letters since they took the form of emails, and especially in the header of an email forwarded to keep someone "in the loop".) GCN = Great Crested Newt GSHP - Ground Source Heat Pump HC or VHC = heat capacity/volumetric heat capacity ICF= Insulated Concrete Formwork IGU = Insulated Glazed Unit (industry term for double or triple glazing) IMHO = "in my honest opinion." (Alternative: "in my humble opinion.") IIRC = "If I remember correctly." IWI = Internal Wall Insulation KISS = Keep It Simple Stupid. (Usually expressed as: "Stick to the KISS principle.") LA = Local Authority LBC = Listed Building Consent. (Needed to carry out work on any Listed building, whether domestic or commercial, privately or publicly owned, which is protected by law because of its historic significance, whether by age or architectural importance attested to by English Heritage.) (See also: Listed Building, above.) LPA = Local Planning Authority LPG = Liquefied Petroleum Gas M&E = Mechanical and Electrical MCB = Miniature Circuit Breaker MDPE = Medium-density polyethylene also referred to as Alkathene. Pipe used to carry mains water and gas, usually buried underground. MI = Manufacturers Instructions MVHR = Mechanical Ventilation [with] Heat Recovery. NPPF = National Planning Policy Framework OEM = Original Equipment Manufacturer OLIVE = Compressible copper ring accompanying threaded plumbing fittings that compresses around the pipe when the fitting is tightened to form a watertight seal. Often reinforced with PTFE tape [see below]. OSB = Orientated strand board Party wall = An internal wall common to two properties. (Not always a contentious issue, but see: http://www.planningp...on/partywallact ) PDR = Permitted Development Rights. (Sometimes just 'PD'. See: http://www.planningp...ssion/permitted ) PGM room stat = Programmable room thermostat: selects both operating times and temperatures. PI = Professional Indemnity (Insurance) PINS = Planning Inspectorate PME = Protective multiple earthing PIR = Rigid Polyisocyanurate Insulation PoE (or POE) = Power over Ethernet. Enables power to be provided to the device (phone or a network camera) using the same cable as that used for network connection. PRV = Pressure Relief Valve PRedV - Pressure Reducing Valve PHE - Plate Heat Exchanger PTFE (tape) = (polytetrafluoroethylene) Tape used to seal threads and joints (e.g. around olives in compressions fittings) in plumbing. Also known as Teflon tape outside the UK PUR = Rigid Polyurethane Insulation PV = Photovoltaics e.g. Roof Solar panels R-value = Thermal resistance [insulation] (the higher the better) RCD = Residual Current Device RCBO = Residual Current circuit Breaker with Overcurrent protection RDF = Refuse Derived Fuel RTFM = Read The Flipping Manual. (The polite version; the less inhibited version is usually expressed with the 'F' meaning what you think it means.) SAP = Standard Assessment Procedure (See: https://www.gov.uk/s...sment-procedure ) (See also: https://www.bre.co.u...P-2012_9-92.pdf ) ( https://www.gov.uk/g...t_file_2012.pdf ) SAPV - SunAmpPV SE = Structural Engineer SEPA = Scottish Environmental Protection Agency SFCU = Switched Fused Connection Unit SHC = Specific Heat Capacity (heat is another word for energy, don't confuse with temperature) SIPs = Structural Insulated Panels SSSI = Site of Special Scientific Interest Stat = Thermostat. (Room stat = wall mounted thermostat/central heating control.) SUDs = SUSTAINABLE URBAN DRAINAGE [system] SVP = soil vent pipe. SWA = Steel Wire Armoured (cable) SWMBO = She Who Must Be Obeyed (Attributed to "Rumpole of The [Old] Bailey", who used the phrase when referring to his wife, but actually from Rider Haggard's "She": https://www.youtube....h?v=bS5YmETSVCI ) TAF = Temporary Amphibian Fence TBH = "to be honest" (As in: "TBH I don't know.") TBF= "to be fair" (As in: "TBF to the builder, he hadn't a clue.) T&E = Twin and Earth (cable) TF = Timber Frame (form of house construction) T&G = Tongue and groove. (Often given in lower-case: t&g.) T&PV = Temperature & Pressure [relief] Valve TS = Thermal Store UFH = Under Floor Heating. (Also expressed as 'Underfloor Heating' but usually still given as UFH.) U-value = Rate of transfer of heat [insulation] (get it as low as possible, below 0.15 if you can) UVC = Unvented Cylinder VCL = Vapour Control Layer WUFI = "Wärme und Feuchte instationär" - Heat and Moisture transfer analysis XPS = Extruded Polystyrene Insulation ZV = Zone valve, motorised or other. (Directs heating medium to wherever needed according to programmed requirements.) UNITS OF MEASUREMENT L x W x H = Length times width times height. (But note that when giving dimensions for windows and doors ALWAYS follow the convention of width first, following by the height.) J = joule (not Joule) W = watt h = hour s= second k = kilo (thousand) kW = kilowatt kWh = kilowatt hour kWp = kilowatt peak (Solar installations - literally peak output.) m = metre (not meter) m2 = square metre (not metre squared) t = time T = temperature °C = Celsius or Centigrade K = kelvin (not °K or degrees Kelvin) k or k often means conductivity R = resistivity U = 1/R g = gram kg = kilogram (the odd SI unit, use it) J/(kg.K) = J/(kg.K) = J.kg-1.K-1 W/(m2.K) = W/m2.K = W.m-2.K-1 f(x) = function of x. (Common usage in thermal and stress calculations as well as statistics.) e = Exponent (1+1/1!+1/2!+1/3!+1/4!...) how things heat up and cool down, how fast things grow, π = pi ratio of a circles diameter to its circumference 3 1 Link to comment Share on other sites More sharing options...
SteamyTea Posted May 30, 2016 Share Posted May 30, 2016 9 hours ago, ProDave said: m2 = square metre (not metre squared) I think this is the wrong way around (and I think I may have posted it originally too) Square meter is shape dependant, e.g. a rectangle of 1 m length by 1 m width. A metre square is not shape dependant, e.g. the surface area of the Cornwall (as it is a really odd shape) 3.563824e+9m² Link to comment Share on other sites More sharing options...
Nickfromwales Posted January 5, 2018 Share Posted January 5, 2018 On 19 January 2017 at 10:51, Nickfromwales said: Just giving this thread a bump for the benefit of our many new members. Enjoy! . The Management 1 Link to comment Share on other sites More sharing options...
Dreadnaught Posted July 13, 2018 Share Posted July 13, 2018 TMV = thermostatic mixing valve: a valve that blends hot water with cold water to ensure constant, safe shower and bath outlet temperatures, preventing scalding. Link to comment Share on other sites More sharing options...
Dreadnaught Posted July 13, 2018 Share Posted July 13, 2018 PC (or PC sum) = a prime cost sum is an allowance for the supply of work or materials that will be nominated by the client. Link to comment Share on other sites More sharing options...
newhome Posted July 13, 2018 Share Posted July 13, 2018 ST = solar thermal Link to comment Share on other sites More sharing options...
Mr Punter Posted July 13, 2018 Share Posted July 13, 2018 Swing shovel = what they call an excavator in Devon (or at least @joe90 does) 1 Link to comment Share on other sites More sharing options...
richi Posted July 20, 2018 Share Posted July 20, 2018 As requested in a thread about battery storage of renewable generation: DoD -- depth of discharge (essentially the opposite of state of charge) SoH -- state of health (a percentage of how much charge it can hold, compared with the as-new spec) Wh -- Watt-hour (a measure of energy) BMS -- battery management system LiFePO4 -- lithium iron phosphate (a rechargeable battery chemistry) 1 Link to comment Share on other sites More sharing options...
Ed Davies Posted October 12, 2018 Share Posted October 12, 2018 EDPM → EPDM Noticed that because I often make the same mistake. It seems quite common for some reason. R = resistance (not resistivity). Is it worth a note that mm² is (mm)² (not m(m²)) and that when people talk about 1, 2.5, 6 or whatever mm cable they usually mean mm² (i.e, cross-sectional area, not diameter)? There was a time when I was confused about that. Link to comment Share on other sites More sharing options...
Ed Davies Posted February 12, 2019 Share Posted February 12, 2019 There's a lot of confusion in the world about kilowatts and kilowatt hours. Here's an attempt at an explanation. The SI unit of energy is the joule (symbol J). It's quite small. Power is the rate at which energy is generated, moved around or used up. The unit is the watt (symbol W). One watt is one joule per second (1 W = 1 J/s). Because the joule is quite small the watt is also not large. It's typically used for relatively low-power devices like lights. The watt is a rate in much the same way that the knot is a rate (1 knot = 1 nautical mile/hour). Talking about watts/hour is about as likely to be wrong as talking about knots/hour (i.e., they're not normally used but could be meaningful in a few odd cases: watts/hour for the output of a PV factory, knots/hour for the acceleration of a supertanker, perhaps). For things like heating the kilowatt (kW) is typically used. 1 kW = 1000 W = 1000 J/s. IMHO, there'd be less confusion if we measured quantities of energy in joules and its multiples. E.g., it'd be better if electricity bills were in MJ (megajoules). But we don't. Instead it's common to use the watt-hour (Wh) and its multiples. One watt-hour is the amount of energy transformed by a power of one watt for one hour. 1 W is 1 J/s and one hour is 3600 seconds so 1 Wh = 1 J/s × 3600 s = 3600 J as the seconds cancel. One kilowatt hour (1 kWh) is one kilowatt for one hour, or 1 watt for 1000 hours or whatever combination multiples to the same amount. 1 kWh = 1000 J/s × 3600 s = 3'600'000 J = 3.6 MJ. 2 1 Link to comment Share on other sites More sharing options...
Markblox Posted February 12, 2019 Share Posted February 12, 2019 On 12/10/2018 at 22:57, Ed Davies said: EDPM → EPDM Noticed that because I often make the same mistake. It seems quite common for some reason. R = resistance (not resistivity). Is it worth a note that mm² is (mm)² (not m(m²)) and that when people talk about 1, 2.5, 6 or whatever mm cable they usually mean mm² (i.e, cross-sectional area, not diameter)? There was a time when I was confused about that. You have to be careful with cable size in DC applications as they can sometimes refer to the diameter of a cable including the insulation. Shouldn't be an issue in our applications unless off grid. 1 Link to comment Share on other sites More sharing options...
Ed Davies Posted February 17, 2019 Share Posted February 17, 2019 BTU = British Thermal Unit, so called because it's mostly used by Americans these days. Strictly, it's a unit of energy (not power). There are various definitions but 1 BTU ~= 1055 joules. Often, though, it's used as a unit of power with an implicit /hour bit omitted. 1000 BTU/hour = 1'055'000 J / 3600 seconds ~= 293 watts ~= 300 W. Link to comment Share on other sites More sharing options...
recoveringbuilder Posted May 27, 2019 Share Posted May 27, 2019 Wish I’d found this thread at the beginning, funnily enough it wasn’t any of the building terms I had trouble with , it was the : swmbo and imho ? took me ages of re reading to work out what the hell you were all talking about! 1 3 Link to comment Share on other sites More sharing options...
patp Posted May 30, 2019 Share Posted May 30, 2019 It's like learning a foreign language ! Link to comment Share on other sites More sharing options...
Ed Davies Posted September 6, 2019 Share Posted September 6, 2019 Capitalization of units: it usually doesn't matter too much in practice but there is a standard which is followed by all scientific journals, etc, which is worth following to avoid the small possibility of confusion. Most accessibly: BIPM SI Brochure and Wikipedia. For capitalization in English and French the rules are pretty simple: 1) Names of units are written in lower case except in situations where any word would be capitalized (beginnings of sentences, titles, etc) even if the unit is named after a person. So meter, gram, watt, joule, pascal and so on. 2) Similarly, when spelled out, the prefixes for multiples and submultiples are written in lower case: mega, kilo, deca, milli, nano. 3) Symbols for units are written in lower case if they're not named after people (m (meter), g (gram), s (second), h (hour)) but initial capped if they're named after somebody (W (James Watt), J (James Prescott Joule), Pa (Blaise Pascal)). 4) The prefix symbols are lower case for prefixes up to and including a thousand (p (pico), n (nano), μ (micro), m (milli), c (centi), h (hecto), k (kilo)) but initial capped for multiples of a million and larger (M (mega), G (giga), T (tera). So the symbol for kilowatt-hour is kWh (or kW·h). All other capitalizations are non-standard. Some odd cases: It's a “degree Celsius”. The unit is the degree; “Celsius” here is not a unit name but the name of the scale (so a proper noun which, following the normal rules, is capitalized) being used adjectivally to say what sort of degree it is. But a kelvin is a unit so it's 300 K or 300 kelvin, not 300 °K or 300 degrees Kelvin. The symbol for the litre is formally “l” (lower case letter el) but many people and some national standards prefer to use uppercase “L” to avoid confusion of the letter with the digit one. I don't know what the appropriate symbol capitalization for the prefix kibi (x 1024) is, whether it's ki or Ki. I've seen both in use. 1 Link to comment Share on other sites More sharing options...
SteamyTea Posted September 6, 2019 Share Posted September 6, 2019 (edited) 5 hours ago, Ed Davies said: Some odd cases: It's a “degree Celsius”. The unit is the degree; “Celsius” here is not a unit name but the name of the scale And there is the odd quirt that C is used for coulomb (named after Charles-Augustin de Coulomb) and is an amp.second, or just to make matter even worse, a farad.volt if talking about capacitors. The sign for farad (named after Michael Faraday) is F, just to confuse with the Fahrenheit scale. Thank goodness for the ° sign (which is Alt + 248, or Alt + 0176 on a PC). Now who wants to explain ' and " with regards to time, distance and angles. And Prime Numbers, or should that be primes. Edited September 6, 2019 by SteamyTea Link to comment Share on other sites More sharing options...
Nickfromwales Posted October 28, 2019 Share Posted October 28, 2019 On 13/11/2018 at 09:53, Nickfromwales said: Just a bump for our newest members. 1 Link to comment Share on other sites More sharing options...
SteamyTea Posted November 17, 2020 Share Posted November 17, 2020 (edited) Just noticed a new abbreviation creeping in: TS = Toolstation TS = Thermal Store. Not that anyone really knows what a thermal store is. Edited November 17, 2020 by SteamyTea 1 Link to comment Share on other sites More sharing options...
Onoff Posted November 17, 2020 Share Posted November 17, 2020 49 minutes ago, SteamyTea said: Just noticed a new abbreviation creeping in: TS = Toolstation TS = Thermal Store. Not that anyone really knows what a thermal store is. Can you think of a sentence where the two abbreviations are interchangeable? Link to comment Share on other sites More sharing options...
joe90 Posted November 17, 2020 Share Posted November 17, 2020 “Do TS sell TS,s ? ? Link to comment Share on other sites More sharing options...
SteamyTea Posted November 17, 2020 Share Posted November 17, 2020 24 minutes ago, Onoff said: Can you think of a sentence where the two abbreviations are interchangeable? 13 minutes ago, joe90 said: Do TS sell TS No Link to comment Share on other sites More sharing options...
Onoff Posted November 17, 2020 Share Posted November 17, 2020 19 minutes ago, joe90 said: “Do TS sell TS,s ? ? Fail! ? "Do thermal stores sell Toolstations?" Just doesn't work does it? 1 Link to comment Share on other sites More sharing options...
SteamyTea Posted November 18, 2020 Share Posted November 18, 2020 Spotted another one (I really need to get out) PHE = Plate Heat Exchanger PHE = Public Health England 23 hours ago, Onoff said: think of a sentence where the two abbreviations are interchangeable Bet you can't Link to comment Share on other sites More sharing options...
Onoff Posted November 18, 2020 Share Posted November 18, 2020 On 17/11/2020 at 16:36, joe90 said: “Do TS sell TS,s ? ? 45 minutes ago, SteamyTea said: Spotted another one (I really need to get out) PHE = Plate Heat Exchanger PHE = Public Health England Bet you can't "PHE demands are such that things get heated". 1 Link to comment Share on other sites More sharing options...
WWilts Posted July 1, 2021 Share Posted July 1, 2021 WBP = water and boil proof plywood (had to look it up) Link to comment Share on other sites More sharing options...
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