Planning your home's electrical wiring before plastering is one of the most important — and most ignored — steps in construction. Once the walls are done, fixing mistakes costs 3x more.
Here's what you need to know before the wires go in.
Why Timing Matters
Electrical conduits (the pipes that carry wires) go inside the walls. Once plastering is done, you can't add or move them without breaking the wall. This is why you must finalize your wiring plan before plastering begins — not after.
Most problems happen because homeowners say "we'll figure it out later." Don't do this.
Step 1: Plan Your Points Room by Room
Walk through each room and mark exactly where you want:
Living Room
- TV point (wall-mounted? Which height?)
- AC point (always on a separate circuit)
- 4–6 general plug points
- Ceiling fan + light
Kitchen
- Refrigerator point (dedicated, never shared)
- Mixer/grinder point
- Chimney point
- Counter-level plug points (for OTG, microwave)
Bedrooms
- AC point
- Bed-side plug points on both sides
- Ceiling fan + light
- Study table plug point
Bathrooms
- Geyser point (dedicated circuit, 15A)
- Exhaust fan point
Don't forget:
- Main gate — light + bell
- Staircase — 2-way switch (control from top and bottom)
- Terrace — outdoor light point
- Inverter/UPS point in one central location
Step 2: Plan for the Future
Add 20% extra points than you think you need. Plug points are cheap during construction. They are expensive after.
Also plan for:
- EV charging point in parking (even if you don't have an EV today)
- Solar panel wiring from rooftop (just run conduit now)
- CCTV camera conduits at entry points and corners
Step 3: Load Calculation — Don't Skip This
Your electrician needs to calculate the total load so the correct wire gauge is used for each circuit.
Rough load guide for a 3BHK:
- Each AC: 2000W (needs 4mm² wire, 20A MCB)
- Geyser: 2000–3000W (dedicated 4mm² circuit)
- Kitchen (heavy appliances): 1500–2000W
- General rooms: 800W each
- Lighting circuits: 400W each
Typical 3BHK total load: 8–12 kW. Your electrician should provide this number and match the main DB accordingly.
Step 4: Use ISI-Marked Materials
This is where many contractors cut costs. Always insist on:
- Wires — Polycab, Finolex, Vguard, RR Kabel, GM (ISI marked)
- MCBs & DB — L&T, Schneider, Legrand, Havells, GM
- Conduit pipes — rigid PVC conduit, not flexible (flexible is for temporary use only)
Cheap wires are the #1 cause of electrical fires in India. This is not the place to save money.
Common Mistakes to Avoid
- No dedicated AC circuits — AC on a shared circuit causes MCB tripping constantly
- Geyser point too low — should be above the tank, not near the floor
- No earth wiring — many contractors skip earth pits. This is dangerous and illegal
- Too few plug points — you will regret not adding more
- Wrong switch board height — standard is 4 feet from floor. Decide and keep it consistent
Before Plastering — Final Checklist
- ✅ All conduit pipes laid and secured
- ✅ Junction boxes placed at every switch/plug location
- ✅ Conduit tested for blockage (pass a wire through each)
- ✅ Earth pits dug and connected
- ✅ Electrician has signed off on the layout
Once this is done, plastering can begin.
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