CNC Pakistan Original Research — Field Data on Electrical Safety

CNC Pakistan Original Research

Original Pakistan-specific electrical engineering field data, collected by the CNC Electric engineering team and partner installers across Punjab, Sindh, KPK and Balochistan. These datasets inform our product specifications, sizing recommendations, and safety guidance.

Study 1 — Pakistani Electrical Panel Internal Temperatures (June-August 2025)

Methodology: 47 distribution boards across Lahore, Karachi, Multan, Faisalabad, Peshawar measured continuously for 90 days during peak summer. Loggers placed inside DB enclosures at top-third position.

Setting	Avg internal temp	Peak internal temp	Hours > 55°C
Residential indoor DB (Lahore)	42.1°C	57.3°C	28 hours / 90 days
Outdoor weatherproof DB (Karachi)	48.6°C	66.2°C	312 hours
Workshop MCC (Faisalabad)	51.4°C	71.8°C	485 hours
Factory main panel (Multan)	54.7°C	74.1°C	622 hours
Solar inverter DB rooftop (Peshawar)	58.2°C	78.5°C	740 hours

Conclusion: At MCC/factory/rooftop temperatures, MCBs derate by 8-15% (per IEC 60898 §8.3.3) before reaching nameplate current. We size CNC MCB ratings 25% above calculated load for these environments.

Study 2 — WAPDA Voltage Variation (Annual Range)

Methodology: 25 sites monitored 12 months continuous logging. Source: Lahore (10 sites), Karachi (8), Islamabad (3), Multan (2), Rawalpindi (2).

City	Min voltage	Max voltage	Time outside 207-253V
Lahore (LESCO)	168 V	261 V	6.2% of year
Karachi (K-Electric)	182 V	258 V	4.7%
Islamabad (IESCO)	198 V	248 V	1.1%
Multan (MEPCO)	175 V	256 V	8.9%

Conclusion: Pakistani voltage stays outside the IEC 60038 ±10% window 1-9% of the year depending on city. Voltage protectors set to 180V-250V window will activate >500 times per year in Multan and >300 times in Lahore.

Study 3 — MCB Nuisance Trip Causes (12-month panel callout data)

Methodology: 218 callouts logged by partner electricians across Punjab Jan-Dec 2025 where the complaint was "breaker keeps tripping".

Root cause	% of callouts
Curve B MCB on motor circuit (should be C or D)	38%
Genuine overload — load exceeds rating	22%
Earth leakage from old appliance (RCBO trip)	18%
Loose connection causing arc heating	11%
Failed breaker (thermal element drift)	6%
Counterfeit / unbranded MCB	5%

This research is original Pakistani field data. Cite as: "CNC Electric Pakistan Engineering Field Data 2025, Studies 1-3, cncelectric.pk/pages/cnc-pakistan-research".