RCD / RCBO selection for apartments and houses

Choose the right residual current device in minutes: type AC/A/B, rating, leakage current (10 mA for bathrooms, 30 mA for sockets, 100 mA fire protection). GorkyCAD calculates it per group automatically.

📐 Floor Plan & Rooms

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Walls & Partitions

Load-bearing and non-load-bearing walls, partitions, thickness and material settings.

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Doors & Windows

Door and window placement, size configuration, opening direction.

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Dimensions & Annotations

Automatic dimensions, callouts, text annotations on the plan.

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DXF Import

Import floor plans from AutoCAD and other CAD systems via DXF.

⚡ Electrical

Outlets & Switches

Power and low-current outlets, switches, dimmers. GOST/IS symbols.

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Lighting

Luminaires, lighting groups, automatic illuminance calculation.

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Junction Boxes

Automatic junction box placement, connection count accounting.

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GOST/PUE/IS Symbols

Complete library of symbols per GOST, PUE, IS, IEC standards.

🔲 Panels

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Auto Panel Assembly

Automatic panel layout: MCBs, RCDs, RCBOs, isolators — from the schematic.

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DIN Rails & Busbars

Automatic DIN rail length calculation, auto busbars per phase.

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Feeder Topology

Panel hierarchy: main → sub → floor → apartment. Automatic connectivity.

〰️ Cables & Routes

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Auto Routing

Automatic cable routing via shortest path with obstacle avoidance.

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Cable Sizing

Automatic cross-section calculation by heating, voltage drop, short-circuit current.

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Cable Schedule

Automatic cable schedule generation with types, lengths, routes.

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Voltage Drop

Voltage drop calculation along the entire chain: from main panel to end consumer.

📊 Calculations

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Loads

Pinst, Pcalc, Icalc, cos φ, Kd — automatic per IEC/IS standards.

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Short-Circuit

Single-phase and three-phase short-circuit current calculation, breaker verification.

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Selectivity

Protection selectivity check: upstream/downstream breaker coordination.

Deterministic Engine

All calculations are deterministic, not LLM. Guaranteed repeatability.

📄 Documents

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PDF Complete Set

Plan, single-line diagram, panel schematic, BOM, cable schedule, estimate — one click.

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DXF Export

Export plans and schematics to DXF for compatibility with AutoCAD and other CAD.

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Bill of Materials

Automatic bill of materials with equipment, cables and materials quantities.

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Estimate

Automatic cost calculation for equipment, cables, and installation work.

🤖 AI Assistant

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Standards Checking

Automatic project check against GOST, PUE, IS, IEC with violation details.

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Recommendations

AI suggests fixes for errors and project optimizations.

Calculation Explanations

Step-by-step explanation of each calculation: formulas, inputs, results.

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Project Search

Semantic project search: find all outlets in the bedroom, check cable size in the kitchen.

🏗️ 3D Visualization

3D Building Model

Automatic 3D building model from floor plan: walls, doors, windows.

3D Cable Routes

3D cable route visualization with color-coded groups.

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3D Panel

Three-dimensional panel visualization with DIN rails and devices.

And this is just the beginning. New features are added every week.

🌐 Open app 🚀 Try for free

How it works

Choose the group: sockets, bathroom, washing machine, stove;
GorkyCAD suggests rating and leakage by load and standard;
You get a complete list of RCDs/RCBOs for the panel.

Types of RCD

Type	Detects	Where
AC	AC leakage	General sockets
A	AC + pulsed DC	Washing machines, electronics
B	All currents	EV chargers, industry

FAQ

What leakage current do I need?

10 mA for bathrooms and children's rooms, 30 mA for socket groups, 100 mA fire protection at the input.

Is RCD required?

Yes, per IEC 60364 / PUE for all socket circuits in new and renovated buildings.

Open the editor

RCD (UZO) tanlash kalkulyatori

Odamlarni elektr toki urishidan va simlarni yong'indan himoyalovchi qoldiq tok qurilmasini (RCD/UZO) tanlang: turi (AC, A, B), nominal tok va uzish toki (10–300 mA) — PUE 7.1-bob va СП 256 talablari asosida.

Kalkulyator nimani hisoblaydi

RCD (qoldiq tok qurilmasi, UZO) izolyatsiya shikastlanganda yoki odam tok o'tkazuvchi qismga teganda tok oqishini qayd etadi va liniyani 30–40 millisekund ichida uzadi. Bu yong'inga qarshi himoyaning eng samarali vositasidir: 300 mA dan ortiq tok yoyi izolyatsiyani alangalantiradi, RCD esa buni o'z vaqtida oldini oladi.

Kalkulyator himoya ob'ektiga qarab uzish tokini (10 mA — bolalar xonalari va nam zonalar, 30 mA — odam himoyasi, 100–300 mA — yong'indan himoya), zanjir yuklama toki bo'yicha esa nominalni (25–63 A) tanlaydi. Zamonaviy elektronika (LED lampalar, kompyuterlar, chastota o'zgartirgichlari) pulsatsiyalanuvchi oqish hosil qilgani uchun tur tanlash ham muhim.

Kalkulyator shuningdek RCD ning avtomat o'chirgich bilan muvofiqligini va yuqori darajali qurilma bilan selektivligini tekshiradi: yong'indan himoya uchun yuqorida S tipidagi 100 mA RCD o'rnatiladi.

Kalkulyatorning xususiyatlari

Maqsadga qarab uzish tokini tanlash: 10 / 30 / 100 / 300 mA
Odam himoyasi uchun 30 mA tavsiya etish (nam zonalarda 10 mA)
Yuklama tokiga qarab nominal tanlash: 25, 32, 40, 63 A
Turni tanlash: AC, A va B (oqish shakliga qarab)
Selektiv S tipidagi RCD tavsiyasi (yong'indan himoya)
Avtomat o'chirgich bilan muvofiqlashtirish va difavtomat alternativi
PUE 7.1.71–7.1.84 talablariga muvofiqlik

Hisoblash formulalari

Nominal tok shart bo'yicha tanlanadi: I_n ≥ I_hisobiy — RCD nominali zanjirning maksimal ish tokidan kam bo'lmasligi kerak. Standart qator: 16, 25, 32, 40, 63, 80 A.

Uzish toki oqish tokidan tanlanadi: I_Δn ≥ 3 × (I_oq_qurilma + I_oq_tarmoq) — PUE 7.1.83 talabi. Tarmoqning tabiiy oqishi taxminan I_oq = I_hisobiy × 0,4 mA/A (maishiy tarmoq uchun).

Selektivlik sharti: yuqori RCD ning uzish toki pastkinikidan kamida 3 marta katta bo'lishi kerak: I_Δn_yuqori ≥ 3 × I_Δn_pastki, masalan, 30 mA → 100 mA.

Odam himoyasi uchun 30 mA tanlanadi, lekin bunda qurilmalarning umumiy tabiiy oqishi 10 mA dan (30 mA ning uchdan biri) oshmasligi kerak.

I_n ≥ I_hisobiy; I_Δn ≥ 3 × (I_oq.q + I_oq.t); I_oq.t ≈ I_hisobiy × 0,4 mA/A; I_Δn.yuqori ≥ 3 × I_Δn.pastki

RCD turlari jadvali

Turi	Qayd etiladigan oqish	Qo'llanish
AC	Sinusoidal o'zgaruvchan oqish	Eski binolar, oddiy maishiy liniyalar
A	Sinusoidal + pulsatsiyalanuvchi o'zgarmas komponent	LED lampalar, kompyuterlar, aqlli uy tizimlari
B	Sinusoidal + pulsatsiyali + silliq o'zgarmas tok	Chastota o'zgartirgichlari, elektromobil zaryad qurilmalari

Me'yoriy baza

RCD o'rnatish PUE 7.1-bob (7.1.71–7.1.84-bandlar), СП 256.1325800.2016 va GOST R 51326.1 (IEC 61008-1), GOST R 51327.1 (IEC 61009-1) hujjatlari bilan tartibga solinadi. Asosiy talablar:

— xonadonlarda va xususiy uylarda rozetka liniyalari uzish toki 30 mA dan oshmaydigan RCD bilan himoyalanadi;

— suv isitgichlari, hammom va dush xonalari liniyalari 10 mA RCD talab qiladi (nam zonalar);

— kirishda 100–300 mA selektiv (S tipidagi) RCD yong'indan himoya funksiyasini bajaradi;

— PUE 7.1.83 ga ko'ra RCD ishga tushmasligi kerak: uning uzish toki tarmoq va qurilmalarning umumiy oqishidan kamida 3 marta katta bo'lishi kerak.

Kalkulyatordan qanday foydalanish kerak

Zanjirning yuklama tokini yoki quvvatini kiriting.
Himoyalanadigan ob'ektni tanlang: rozetka liniyasi, hammom, kirish, quruq qurilmalar va h.k.
Tarmoqdagi qurilmalar tarkibini belgilang (elektronika bormi).
Selektivlik talabini ko'rsating: RCD lar ikki darajada o'rnatiladimi.
«Hisoblash» tugmasini bosing va tur, nominal, uzish toki hamda ulanish sxemasini oling.

Tez-tez uchraydigan xatolar

Zamonaviy elektronika bilan AC tipidagi RCD tanlash — pulsatsiyalanuvchi oqish qayd etilmaydi, qurilma ishlamaydi.
Odam himoyasi uchun 100 mA tanlash — bunday RCD faqat yong'indan himoya qiladi, tok urishidan emas.
RCD ni avtomat o'chirgichsiz o'rnatish — haddan tashqari yuklama va qisqa tutashuvdan himoya yo'q.
Nominal yuklama tokidan kichik tanlangan — haddan tashqari yuklamada RCD qiziydi va ishdan chiqadi.
Selektivlikni hisobga olmaslik — oqishda yuqori RCD pastkinikidan tezroq ishlaydi, butun ob'ekt quvvatsiz qoladi.
Ikki simli tarmoqda (PE siz) RCD ni noto'g'ri ulash — qurilma ishlamaydi yoki doim ishga tushadi.

RCD tanlash haqida tez-tez beriladigan savollar

RCD nima uchun ishga tushadi (uzadi)?

Eng ko'p uchraydigan sabablar: izolyatsiyaning eskirishi yoki shikastlanishi, nam xonalardagi namlik, qurilmaning ichki oqishi (isitish elementlari), noto'g'ri ulanish yoki tarmoqning tabiiy oqishining me'yordan oshishi. Oqish joyini aniqlash uchun liniyalarni birma-bir uzish tavsiya etiladi.

RCD va difavtomat o'rtasidagi farq nima?

RCD faqat oqish tokidan himoya qiladi va albatta avtomat o'chirgich bilan tandem ishlaydi. Difavtomat esa bitta korpusda RCD + avtomatni birlashtiradi: oqish, haddan tashqari yuklama va qisqa tutashuvdan himoya qiladi. Difavtomat qalqonda kamroq joy egallaydi, lekin qimmatroq.

Ikki simli eski uyda (PE o'tkazgichsiz) RCD o'rnatish mumkinmi?

Ha, TN-C tarmog'ida RCD ishlaydi va tok urishidan himoya qila oladi, lekin maishiy qurilmalar korpusiga oqishda RCD ulangan liniyadagi barcha qurilmalarni o'chiradi. Muhim shart: PE yo'qligi sababli barcha himoya o'tkazgichlari faqat RCD ning pastki tomoniga ulanishi kerak. Ishonchli yechim — tarmoqni TN-C-S ga qayta qurish.

Hammom uchun qaysi RCD tanlash kerak?

Nam zonalar uchun 10 mA uzish tokli RCD tavsiya etiladi — odam himoyasi uchun eng xavfsiz chegara. Liniya suv isitgichiga (boiler) ketsa, 30 mA RCD bilan difavtomat yetarli, lekin qabul qilingan amaliyotda nam xonalarda 10 mA qurilma tanlanadi. Elektr issiqlik pol uchun ham 30 mA RCD majburiy.

Nega 10 mA emas, aynan 30 mA tanlanadi?

30 mA odam uchun xavfsiz chegara hisoblanadi: yurak fibrillyatsiyasiga olib kelishi mumkin bo'lgan tok 50 mA dan boshlanadi, 30 mA da mushak qisqarishi hali hayot uchun xavfli emas va qurilma 30 ms ichida uzadi. Kichikroq 10 mA qurilmalar faqat nam zonalar uchun ishlatiladi, chunki butun maishiy tarmoqning tabiiy oqishi 10 mA dan oshishi mumkin va qurilma doim ishga tushadi.

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