Blog
Guides 19/10/2026 INVENTĀRS
DIN energy meters
A DIN energy meter in the board shows how many kWh a circuit or a tenant takes. It is not the DSO billing meter at the incomer and not an LBN 53.4 acceptance test — see acceptance tests. This page is how to read the card: phases, current, MID, S0, CT. LBN 261-15 does not specify a meter model. P.8³: dwellings with incomer protection above 32 A are three-phase. No live CT wiring steps. FieldMeaningMistake 1 ph. / 1P+NSingle-phase circuitUsing it on a three-phase site “because 40 A is enough” 3 ph. / 3P / 3P+NThree phases; N only if the card says soOne 1-phase meter on one phase “to see the ho..
Buying advice 19/10/2026 INVENTĀRS
Room and floor thermostats
Heating control starts with what you measure and what you switch, not with Wi-Fi. This page has four products the shop often labels “thermostat”. Generic timers stay in timers. Large loads through a contactor: contactors. LBN 261-15 does not specify a thermostat model. P.28¹ is about residual-current protection on sockets and lighting, not Sedna vs Merten. No wiring diagrams, no live work. JobWhat fits hereWhat it is not Water or cable floor, flush wallFloor / universal wall thermostat in a frameA 0…60 °C DIN cabinet thermostat; a Wi-Fi plug Room radiator / convector, flushRoom thermostat in..
How-to 19/10/2026 INVENTĀRS
Cable marking in the board
In a board that another electrician opens a year later, marking is safety. LBN 261-15 does not specify Phoenix or Legrand. P.53 requires drawings; p.55 certified supervision. Our recommendation (not an LBN clause): each group has the same code on the device, on the N/PE bar and on the outgoing conductor. This how-to is about what each marker is for and how it matches terminal pitch. No live work. Ratings: terminals and busbars. What you markWhat fitsDo not mix DIN terminal legendZack strip or WMB card vs terminal widthA cable sleeve stuck on the terminal cover The conductor at the terminalCA..
Guides 19/10/2026 INVENTĀRS
DIN rail and distribution-board accessories
Once the protection scheme is clear, the remaining question is where the devices actually sit. A modular consumer unit, an empty metal box with a mounting plate and a loose DIN rail are not the same product. This guide helps you choose the enclosure, rail, blanking strip and door. Device ratings still belong in the board bill of materials — this page does not retarget “distribution boards price”. Information, not a design. LBN 261-15 p.55: installation under a certified specialist. P.17: equipment must withstand site conditions. Conformity to LVS EN 61439 sits with whoever assembles the board ..
Comparisons 18/10/2026 INVENTĀRS
Time switches and staircase relays
The relay and timer shelf mixes three jobs: staircase delay after a push-button, a daily/weekly programme, and sunrise/sunset (astronomical). An installation contactor (Z-SCH, iCT) is a fourth job — see the contactor article, not this page. LBN 261-15 does not name a timer model. Point 28.1 (3) is about 30 mA on household lighting circuits, not about Finder versus Hager on stairs. JobFitsDoes not replace Stair light after a button, then offStaircase relayA daily time switch Shop window / heating / pump by the clockMechanical or digital day/week switchA staircase relay Outdoor light by sunris..
Guides 18/10/2026 INVENTĀRS
Motor protection and contactors
A motor circuit usually has three jobs: overload protection, short-circuit protection and switching. They can be combined or split. A common mistake: fitting a household C-curve MCB and assuming the motor is protected. Information, not a design and not a start-up procedure. Motor circuits are designed and set by a certified specialist. Labels: LBN, standard, manufacturer recommendation. Three devices, three jobs DeviceWhat it doesWhat it does not do alone Motor-protective circuit breaker (MPCB, MMS)Thermal-magnetic protection: overload + short circuit; often an adjustable thermal setting in..
Guides 18/10/2026 INVENTĀRS
CEE industrial sockets: 16 A, 32 A, 4P and 5P
A CEE industrial socket (IEC 60309, often P17, Hypra, Pratika) is a round connector with a fixed protective-contact clock position. It is not a household Schuko and not an Italian P11. This guide is how to read 16 A / 32 A, 4P / 5P, 6h and IP from the card, and where LBN 261-15 touches outdoor sockets. Information, not a design. We do not claim two devices “fit together” unless current, voltage, poles and clock position match. ParameterRead on the cardCommon mistake Current16 A or 32 A (63 A is another size)Expecting a 16 A plug to fit a 32 A socket Poles3P, 4P (often 3P+E here) or 5P (3P+N+..
Guides 18/10/2026 INVENTĀRS
IP protection and cable glands
Enclosure IP and the cable entry together decide whether a joint stays dust- and water-protected after assembly. A common mistake: buy an IP65 box and drill a hole without a matching gland. This guide is how to read IP and gland range from the card, not how to guess millimetres. LBN 261-15 point 17 requires equipment to withstand the environmental conditions at the place of installation (Annex 3) — that is not “IP65 on every outdoor box”. On the cardMeaning (IEC 60529)Example IP55 / IP56Dust-protected + water jet / stronger jet as declaredGewiss GW44218 — IP56, internal 240×190×160 mm, smoot..
Guides 18/10/2026 INVENTĀRS
Electrical installation acceptance and tests
Building electrical installations are taken into service under construction law. LBN 261-15 point 53 lists what is attached to the acceptance act if the relevant work was done. This guide is for a professional audience and the client: what is documented, what is measured and who may do it. It is not a guide to measuring live, bypassing protection or “energising the site” yourself. Point 53.4 (checked likumi.lv 18 Oct 2026) requires approved reports on: conductor/cable electrical resistance tests; full impedance measurements of the phase–neutral loop; leakage resistance tests of earth-electrode..
Guides 18/10/2026 INVENTĀRS
Terminals and busbars in the board
In a board, conductors are not joined “wherever it fits”. There are at least three different parts: N and PE bars, a phase comb busbar between MCBs, and DIN terminals for outgoing conductors. This guide helps you read cards and compile a materials list, not install connections yourself. LBN 261-15 does not name a WAGO or Hager model. Point 55: installation under a certified construction specialist. Isolated ferrules are almost unpublished in our range (more sit unpublished in BoL), so we do not recommend ferrule SKUs here. Count modules first in the board bill of materials. MCB In and curve: c..