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Electrical wiring — FR, FRLS, ZHFR cables, conduits and switchgear

Electrical wiring is one of the most safety-critical elements of your home. The right cable type, proper conduit sizing and quality switchgear can prevent fires and protect your family for decades.

Simple summary — for homeowners

For all concealed wiring in your home, specify FRLS (Flame Retardant Low Smoke) cables from reputed brands like Finolex, Polycab or Havells. In a fire, FRLS cables emit less smoke than standard FR cables — giving occupants more time to escape. Never use substandard or unbranded cables to save cost — electrical fires are devastating and untraceable once walls are closed. Always run wiring in PVC conduits — never lay bare cables in walls. Ensure your electrician provides a proper load calculation and circuit diagram before starting work.

Cable types comparison

Cable type
Standard
Best use
Max temp
Smoke
Halogen
FR (Flame Retardant)
IS 694
General wiring — lights, fans, sockets
70°C
High
Yes
FRLS (FR Low Smoke)
IS 694
Concealed wiring, conduit runs
70°C
Low
Yes
ZHFR (Zero Halogen FR)
IS 694
Premium concealed wiring
70°C
Very low
No
XLPE
IS 7098
Main supply cables, high load circuits
90°C
Low
Yes
Armoured cable
IS 1554
Underground runs, outdoor exposed
70–90°C
Low
Yes

Cable sizing guide

Cable size
Typical use
Max current
1.0 sq mm
Light points, fan points
10A
1.5 sq mm
Light and fan circuits
15A
2.5 sq mm
General plug points, AC points
20A
4.0 sq mm
Geysers, washing machines, heavy appliances
25A
6.0 sq mm
Sub-main, large AC units
32A
10 sq mm
Main distribution, EV charging
45A
16 sq mm+
Main incoming supply
60A+

Conduits — PVC vs GI

PVC conduit
Lightweight — easy to handle and install
Corrosion-resistant — no rusting
Good for concealed wiring in walls and ceilings
IS 9537 Part 3 certified
Cannot be used where mechanical damage is possible
Standard choice for residential wiring
GI (Galvanized Iron) conduit
Heavy duty — mechanical protection
Used in exposed wiring and industrial areas
Earthed conduit provides additional safety
IS 9537 Part 2 certified
Higher cost and installation time
Required in garages, utility areas, factories

Reputed brands in India

Cables and wires
FinolexPolycabHavellsKEIRR KabelAnchor
Switches, sockets and MCBs
LegrandSchneider ElectricAnchorHavellsFinolexGM Modular

Critical safety requirements

01
Earthing is mandatory
Every circuit must be properly earthed. Earth leakage circuit breakers (ELCB) or residual current devices (RCD) must be installed in all wet areas — bathrooms, kitchen, utility.
02
Separate circuits for heavy loads
Air conditioners, geysers, and ovens must each have a dedicated circuit with appropriately sized cables and MCBs. Never share heavy load circuits.
03
MCB ratings must match cable ratings
The MCB (Miniature Circuit Breaker) must be rated at or below the cable capacity. An oversized MCB will not protect the cable from overheating.
04
Never run cables without conduit
Bare cables in walls or under plaster are a fire hazard and an IS code violation. All wiring must run through IS-certified PVC or GI conduits.
05
Get an electrical completion certificate
After wiring is complete, a licensed electrical contractor must inspect and certify the installation. This is required for BESCOM connection and insurance claims.
Homekrate recommendation
Basic
FRLS cables (Finolex/Polycab) + PVC conduit + Anchor switches
IS-marked FRLS throughout. Safe and reliable for standard residential.
Standard
FRLS cables (Finolex/Polycab) + PVC conduit + Havells switches and MCBs
Our default. Better switchgear quality, modular switches for clean finish.
Premium
ZHFR cables + PVC conduit + Legrand or Schneider modular switches
Safest cable type, premium modular switches, full circuit protection.
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