Switchboard Planning and Modular Switches

A switchboard is the part of a home that people touch most often. Lights, fans, chargers, geysers, the TV and the kitchen appliances all pass through it, twenty or thirty times a day. Yet in most Indian homes, switchboards are placed by the electrician on site, after the walls are up, wherever a conduit happened to arrive. The results are familiar: a board hidden behind the open door, a bedroom where you must walk across the dark room to switch off the light, a kitchen socket buried behind the refrigerator, a living-room plate with sixteen identical switches that nobody can remember, and a bedside with no socket for a phone.

Modular switches have made the hardware far better than the old piano switches screwed onto wooden boards. They come in standard modules, fit concealed boxes, and are available in finishes from plain white to glass, metal and touch panels. But better hardware does not fix bad planning. The position, height, grouping and labelling of a board decide whether it is pleasant to use, and those decisions belong on the drawings, alongside the furniture layout, before a single wall is chased.

This guide works through switchboard planning room by room. It explains how modular systems are built up from modules, plates and boxes, gives mounting heights and dimensioned drawings for door, bedside, TV, kitchen and bathroom boards, sets out a logical order for switches, covers safety rules from the Indian codes, compares switch types and costs at indicative October 2026 rates, and explains how to make today's wiring ready for tomorrow's smart switches. It goes deeper on the board itself than this site's general electrical layout guide, and uses the same heights and per-point costs.

From porcelain switches to touch panels

Domestic switches in India went through three broad generations. In older homes, wiring often ran on the surface along wooden battens, and switches were round porcelain or Bakelite units, or rows of small piano-type switches fixed on a wooden board screwed to the wall. These boards were easy to repair but collected dust, and the open wooden backing was a poor enclosure for live connections. The second generation brought concealed wiring in conduits chased into the wall, with flush piano switches on metal or plastic plates, a big step in safety and appearance.

The third generation, which has become the norm in new Indian homes over the last two decades or so, is the modular system: every switch, socket, regulator and outlet is a standard-sized module that clips into a frame inside a concealed box, finished with a cover plate. Modules can be mixed freely, plates come in many finishes, and a faulty module can be replaced without disturbing its neighbours. Today a fourth generation is spreading — touch panels, scene keypads and smart modules connected to Wi-Fi or other wireless networks — and it places new demands on the boxes and wires behind the plate.

How a modular system works

A modular range is built from three parts. The module is the device itself: a switch, socket, fan regulator, dimmer, USB charger, bell push, TV or data outlet. Its size is counted in modules (M); in the common 45 mm module system used by most Indian ranges, one module is about 22.5 mm wide and 45 mm high, so a 2M device is a 45 mm square. The plate, with a frame behind it, holds a set number of modules — 1M, 2M, 3M, 4M, 6M, 8M, 12M, 16M or 18M, horizontal or square. And the box, concealed in the wall, must match the plate. Boxes and plates must come from the same range, because outer sizes and fixing centres differ between manufacturers.

Fig. 1 shows how devices fill common plates. A 6 A switch takes one module; a 6 A three-pin socket usually two; a combined 6/16 A socket two or three depending on the range; a step-type fan regulator one or two; a dimmer one or two; a USB charger one or two; TV and data outlets one each. Unused spaces are filled with blank modules. The square 8M and 12M plates stack two rows, which keeps a board compact; long single-row plates of 12M and above become hard to read and are better split into two plates side by side or one above the other.

Where every switchboard should go

The single most important rule is that every room's main board sits at the entrance, on the latch side of the door, where the hand finds it before the foot enters the dark. The board should be about 150–200 mm from the door frame so the architrave and the hand do not collide, at about 1100–1200 mm above the finished floor, which is the common Indian practice used in this site's electrical layout guide. Where elderly family members or wheelchair users live, accessibility guidance in the Harmonised Guidelines and Standards for Universal Accessibility in India (2021) favours switches lower, around 900–1100 mm; many families now choose about 1050 mm as a compromise for the whole home. Whatever height is chosen should be used everywhere, aligned with door handles, tile joints or panel lines.

Beyond the door board, each room needs secondary boards where people actually are: beside the bed, at the study desk, on the TV wall, beside the sofa, on the kitchen counter, in the utility. The furniture layout decides these, which is why the board plan must be drawn after the furniture plan and before the walls are chased. A board placed for a bed that later moves 600 mm is hidden behind a side table for the life of the house.

Bedside, sofa and TV boards

The bedside board is the second most used board in a home and the most often badly placed. Its job is to let a person lying in bed switch off the main light, control the fan, charge a phone and plug in a lamp without getting up. The main light should therefore be on a two-way circuit — switchable from both the door and the bed — and the fan regulator at the bedside rather than only at the door. The board should sit at 700–900 mm, just above the side table and clear of the headboard edge, on both sides of a double bed.

On the TV wall, the board behind the screen carries the TV's power socket and a data or TV outlet, so no cable shows below the screen. A 25 mm conduit from behind the TV down to the console lets HDMI and other cables pass later, and a second board at console level serves the set-top box, sound bar and router. In the living room, a small board beside the sofa for a lamp and a phone charger is one of the most appreciated details in any home, and one of the most often forgotten.

Kitchen, utility and bathroom boards

Kitchens need more power points than any other room, and they need them in exact positions. The counter board sits at about 1000–1100 mm, 150–200 mm above the counter, clear of the backsplash joint so tiles or quartz can be cut cleanly around it. Boards should be kept away from the sink and the hob — a horizontal distance of roughly 300 mm or more from the sink edge is a sensible design habit — and no socket should sit directly above a gas hob, where heat and spills reach it. Appliance points (refrigerator, microwave, oven, chimney, water purifier, dishwasher) are placed from the appliance list, not guessed. The chimney point sits at about 2100–2200 mm, hidden inside the chimney duct cover.

Bathrooms are where switch planning becomes safety planning. Water and electricity must be kept apart: switches for the bathroom light, exhaust and geyser are best placed outside the bathroom door, with an indicator for the geyser. Where a switch or socket must be inside — for a mirror light or a shaver — it should be in the dry area, well away from the shower and basin spray. Many designers use the zone approach from the international standard IEC 60364-7-701, which keeps sockets out of the area within about 600 mm of a shower or bath; Indian practice under the National Building Code and IS 732 similarly requires that accessories in bathrooms be placed and protected so that water cannot reach them. All bathroom circuits should be protected by a 30 mA RCCB at the distribution board.

A switch order the whole family can remember

A board with six identical rockers is a puzzle every evening. The fix costs nothing: decide one order and use it in every room. A practical rule used by many designers is to arrange switches from the door inwards — the light nearest the door first, then the main ceiling light, then the decorative lights, then the fan and its regulator last — so the order on the board matches what the hand expects as it enters. Sockets sit at the right end or on a second row. Where a board controls lights in two rooms, which should be avoided, the switches for the other room are separated with a blank module.

Labelling helps visitors, elderly parents and new domestic staff. Many modular ranges offer small printed or engraved symbols; a discreet label on the inside of the plate frame at least helps the electrician. Matching plate positions across a house — every door board at the same height, every bedside at the same height, every plate aligned with the nearest tile joint or panel line — is what makes switchboards look designed rather than scattered.

Safety rules from the codes

Switches and sockets are safety devices, and the Indian codes are clear about the basics. Wiring practice is governed by IS 732 (Code of practice for electrical wiring installations) and the National Building Code of India 2016, Part 8, Section 2 (Electrical and allied installations). Switches for domestic use are covered by IS 3854, and plugs and socket outlets by IS 1293. Buy ISI-marked products, and have the installation done and tested by a licensed electrician.

• Switches must break the phase (live) conductor, never only the neutral, so that a switched-off fitting is truly dead.
• Use 16 A sockets and switches with 2.5 sq mm cable for geysers, microwaves, irons, room heaters and washing machines; never run a heater from a 6 A socket.
• Give every air-conditioner, geyser and heavy kitchen appliance its own circuit and MCB, as set out in the electrical layout guide.
• Protect sockets and wet-area circuits with a 30 mA RCCB, and test it with its test button every few months.
• Earth every socket and every metal box, plate or frame; a three-pin socket without a proper earth is a false comfort.
• Use shuttered sockets at low level in homes with small children.
• Keep sockets out of shower and basin spray, and switches for bathrooms outside the bathroom where possible.
• Do not overload plates: one 16 A appliance per socket, no multi-plug adaptors on heavy loads.

Choosing switches: types and indicative costs

Switch ranges differ in mechanism life, material, finish, fit of the plate to the wall and availability of spare modules years later. A good mid-range modular range from an established manufacturer is the sensible default for most homes. Premium ranges add better materials — metal, glass, wood or leather-textured plates — and smoother mechanisms. Touch and smart panels add scenes, timers, app and voice control. Prices below are indicative October 2026 retail ranges; per-point installation costs follow this site's electrical layout guide and are separate from the switch range itself.

The switch range is the easiest part of the electrical system to upgrade later — plates can be changed in an afternoon — while cable quality, earthing and protective devices cannot be upgraded without breaking walls. If the budget is tight, spend on the wiring, the board and the RCCBs first, and on the plates second.

Getting ready for smart switches

Even families who do not want smart switches today should wire for them, because the cost is small now and large later. Most smart switches and touch panels need a neutral wire at the switch box, which traditional switch wiring often leaves out because a simple switch only needs the phase and the switched wire to the light. They also often need deeper boxes than a basic modular switch, because the electronics sit behind the plate. Run a neutral to every switch box, choose boxes deep enough for the smart range you might use (check the manufacturer's data), keep good Wi-Fi coverage in mind when planning access points, and leave a spare conduit from the main board to a central location for a future hub or network cabinet.

The direction of travel is clear. USB-C chargers built into plates, scene keypads that set the whole room in one press, and voice and app control are becoming common in mid-range homes, not just in luxury projects. Interoperability standards for smart home devices are maturing, which should make it easier to mix brands in future. What will not change is the physical logic: a board where the hand expects it, at a height the whole family can reach, with an order that makes sense in the dark.

Rules for switchboard planning

• Draw the furniture layout first, then place every switchboard on it — never let boards be decided on site.
• Put each room's main board on the latch side of the door, 150–200 mm from the frame, at one height throughout the home (1100–1200 mm, or 900–1100 mm for accessible homes).
• Give every bed two-way control of the main light, a fan regulator, a USB charger and a socket on both sides at 700–900 mm.
• Use the same switch order in every room — from the door inwards, fan last — and split boards above about 8–12 modules.
• Keep bathroom switches outside, sockets out of the wet zones, and every wet-area circuit on a 30 mA RCCB.
• Use 16 A points with 2.5 sq mm cable for heavy appliances, and no socket above the hob.
• Run a neutral to every switch box and use deeper boxes so smart switches can be added later.
• Buy ISI-marked boxes, plates and modules from one range, and have the installation tested by a licensed electrician.

Frequently asked questions

What is the standard height of a switchboard from the floor in India?

Common practice is about 1100–1200 mm to the centre of the main board at the door, 700–900 mm for bedside boards, 300–450 mm for general sockets and 1000–1100 mm for kitchen counter boards. Homes designed for elderly or wheelchair users often place switches at about 900–1100 mm.

How many modules does a switchboard need?

Count the devices: one module per switch, two for a 6 A socket, two or three for a 16 A socket, one or two for a regulator or dimmer. A bedroom door board commonly needs 6–8 modules; boards above about 12 modules are easier to use if split into two plates.

Which modular switch brand is best?

Choose an established manufacturer's ISI-marked range with good spares availability in your city, and buy boxes, frames and plates from the same range. Mechanism feel, plate fit and finish durability matter more than the brand name; ask to operate a sample board before choosing.

Do smart switches need a neutral wire?

Most do, because their electronics need constant power. Many older homes have no neutral at the switch box. Running a neutral to every switch box during construction or rewiring is the simplest way to keep smart switches possible later.

Can a switchboard be placed inside the bathroom?

It is better outside. If a switch or shaver socket must be inside, it should be in the dry area, well away from shower and basin spray, and the circuit should be protected by a 30 mA RCCB. A licensed electrician should confirm the position.