Question 1

Why is 3-Phase distribution board (DB) phase balancing crucial?

Accepted Answer

When single-phase loads (such as inverter air conditioners, water pumps, and kitchen appliances) are unevenly distributed across the 3 phases of a building, it creates severe voltage unbalance, overheats the neutral wire, triggers nuisance circuit breaker trips, causes high line losses, and can damage sensitive inverter electronics. Our engineers use digital clamp meters and power quality analyzers to balance amperage equally across all 3 phases (R, Y, B).

Question 2

How does electric.com.pk detect concealed short circuits inside walls without damage?

Accepted Answer

Our uniformed engineers utilize industrial-grade Fluke thermal imaging cameras to locate infrared heat signatures generated by resistive connections, overloaded junction boxes, and concealed wiring faults behind plaster and drywall. Combined with high-voltage digital insulation resistance testers (Megger), we isolate and repair exact fault points without tearing down walls unnecessarily.

Question 3

What is chemical earthing / grounding and why is resistance below 3–5 Ohms critical?

Accepted Answer

Chemical earthing involves boring a deep grounding hole (30–50 ft), installing a high-conductivity copper-bonded rod, and surrounding it with carbon-rich Earth Enhancing Compound (bentonite/graphite) to ensure low soil resistivity throughout summer droughts. Low earthing resistance (<3 Ohms for residential, <1 Ohm for solar/commercial) is vital to discharge lightning strikes, surge currents, and short-circuit faults instantly, preventing electric shocks and inverter board burnout.

Question 4

What are Surge Protection Devices (SPDs) and why are Type 1 and Type 2 required?

Accepted Answer

Surge Protection Devices (SPDs) protect electrical equipment from high-voltage transient spikes caused by lightning, DISCO grid switching, and transformer surges. Type 1 SPDs handle direct lightning currents at the main intake, while Type 2 SPDs clamp residual voltage surges at sub-distribution boards and solar inverter DC/AC disconnect boxes.

Question 5

Why do standard circuit breakers (MCBs) trip frequently when air conditioners start up?

Accepted Answer

Air conditioning compressors and induction motors draw an initial inrush starting current 3 to 5 times higher than their running current. If an older Type B curve circuit breaker is installed, it may trip instantly on inrush surge. Our engineers evaluate motor startup currents and retrofit correctly rated Type C or D curve miniature circuit breakers with appropriate breaking capacities (6kA or 10kA).

Question 6

Can electric.com.pk install residential EV (Electric Vehicle) Wallbox chargers?

Accepted Answer

Yes. We engineer dedicated EV charging circuits for Level 2 home chargers (7.4kW single-phase up to 11kW/22kW 3-phase) for Tesla, Audi e-tron, BYD, MG, Deepal, and Haval vehicles. Every installation includes a dedicated Type-B RCBO (residual current breaker with DC leak detection), heavy-gauge 6mm²–10mm² pure copper cabling, dedicated earthing pit verification, and Type 2 surge arresters.

Question 7

What is neutral floating / neutral loss and how does it destroy home appliances?

Accepted Answer

In a 3-phase electrical supply, the neutral wire provides the return path and maintains phase-to-neutral voltage at 230V. If the main neutral line breaks, oxidizes, or loosens (neutral floating), phase voltages can surge wildly up to 380V–400V across lightly loaded circuits, instantly burning televisions, refrigerators, air conditioners, and inverter motherboards. We install digital Over/Under Voltage Protection Relays with auto-disconnect and heavy-duty neutral crimp links.

Question 8

What cable brands and safety specifications does electric.com.pk utilize?

Accepted Answer

We strictly install 99.99% pure oxygen-free copper cables with fire-retardant (FR / LSZH) PVC insulation from certified Pakistani manufacturers, including Pakistan Cables, Fast Cables, and GM Cables (complying with BS 6004, IEC 60227, and PS 112 standards).

Question 9

What is the difference between an MCB, MCCB, RCCB, and RCBO?

Accepted Answer

• MCB (Miniature Circuit Breaker): Protects against overloads and short circuits up to 63A.
• MCCB (Molded Case Circuit Breaker): Heavy-duty switchgear for high currents (100A–800A+) with adjustable trip settings for commercial/industrial panels.
• RCCB / ELCB (Residual Current Circuit Breaker): Detects current leakage to earth, preventing fatal electric shocks to humans.
• RCBO: Combines the functions of an MCB and an RCCB into a single compact DIN-rail device, offering complete overload, short-circuit, and human shock protection.

Question 10

How is an older house rewired from degraded aluminum/sub-standard wiring to pure copper?

Accepted Answer

Older residences in Pakistan (built 20–40 years ago) often contain brittle, oxidized aluminum wiring, undersized 3/0.029 cables, or brittle rubber insulation with severe fire risk. Our turnkey house rewiring protocol includes:
1. Digital Megger insulation resistance testing to map compromised runs.
2. Concurrently pulling 99.99% pure copper FR/LSZH cables through existing conduits.
3. Installing separate dedicated earth wires to all socket circuits.
4. Upgrading old wooden fuse boards to DIN-rail IP65 distribution boards with dual RCBO shock protection.

Question 11

How do Automatic Transfer Switches (ATS) synchronize generators, solar, and grid power?

Accepted Answer

An Automatic Transfer Switch (ATS) panel features motorized interlocked contactors and micro-controllers. When DISCO grid power fails, the ATS instantly isolates the utility intake (preventing hazardous reverse electrocution to linemen) and starts the generator after a 10-second stabilization delay. In solar hybrid homes, the ATS coordinates with the inverter to ensure the generator never backfeeds into the solar array.

Question 12

What wiring provisioning is required for modern smart home automation?

Accepted Answer

Smart switches (WiFi, Zigbee, Matter) require a dedicated neutral wire inside every gang switch box to continuously power their internal radio chips. Traditional Pakistani wiring often loops only the live phase wire through switch boxes. electric.com.pk pre-wires neutral drops, deep 35mm back boxes, and low-voltage shielded CAT6 cabling for smart lighting, automated motorized curtains, and smart thermostat integration.

Question 13

What does an electrical fire safety audit and thermographic insurance inspection entail?

Accepted Answer

Electrical fires cause 70%+ of structural fires in Pakistani commercial and residential properties. Our certified fire safety inspection includes:
• Full-panel thermographic infrared scanning under peak electrical load.
• Cable conductor sizing and thermal insulation resistance audit.
• Earth pit resistance measurement and earth-continuity loop impedance test.
• Ground fault and RCCB trip-time calibration (30mA / <40ms).
• Issuance of an official PEC-stamped Electrical Safety Certificate for insurance underwriters and fire safety compliance.

Question 14

What diagnostic tools do electric.com.pk engineers carry on service visits?

Accepted Answer

Every technician bike and van is equipped with calibrated professional instruments: Fluke infrared thermal cameras, True-RMS digital clamp multimeters, high-voltage Megger insulation resistance testers, digital earth resistance ground testers, 1000V insulated torque screwdrivers, phase rotation meters, and circuit breaker loop impedance testers.

Certified in-house electricians. Delivered to your doorstep.

Service directory with upfront base pricing

Solar Maintenance & Diagnostic

DB Box & Breaker Upgrades

Fault Finding & Repairs

Smart Home & EV Chargers

Frequently Asked Questions