What Electrical Documentation Covers
Electrical documentation provides the evidence chain that a building's electrical installation was properly designed, installed, tested, and remains safe for continued use. It encompasses design certificates, installation test certificates, periodic inspection and testing reports, equipment maintenance logs, and compliance records. For any building undergoing due diligence, electrical documentation is a core requirement alongside structural and fire safety records.
Why It Matters
Electrical faults cause approximately 20-30% of building fires globally. In Bangladesh, electrical safety incidents in commercial and industrial buildings are a significant concern, with overloaded circuits, poor earthing, and deteriorated wiring being common root causes. Insurance claims related to electrical failures are among the most frequent and expensive building claims. From a corporate perspective, electrical safety directly impacts occupant safety, operational continuity, and regulatory compliance.
Key Documents
Electrical Installation Certificate: Issued by the installing electrical contractor upon completion of a new installation or significant alteration. Certifies that the installation complies with the applicable standard (BS 7671, IEC 60364, or BNBC electrical provisions). Should include details of the design, construction, and inspection and testing results. Must be signed by the qualified person responsible for the design, construction, and verification.
Electrical Test Certificates: Document the results of initial verification testing including continuity of protective conductors, insulation resistance (minimum 1 megaohm at 500V DC), polarity verification, earth fault loop impedance, RCD operation times, and prospective fault current at the origin. These results establish the baseline for future periodic testing comparisons.
Periodic Inspection Report (EICR/PIR): A comprehensive report on the condition of an existing electrical installation. Performed at intervals determined by the installation type: every 5 years for commercial buildings, every 3 years for industrial premises, and every 1 year for special installations (swimming pools, construction sites). The report classifies observed deficiencies using codes: C1 (danger present, immediate action required), C2 (potentially dangerous, urgent remedial action), C3 (improvement recommended), and FI (further investigation required).
Earthing and Lightning Protection Certificates: Verify that the earthing system resistance is within acceptable limits (general earthing less than 5 ohms, lightning protection less than 10 ohms per BS EN 62305) and that lightning protection systems comply with design standards. Should include earth resistance test results, bonding verification, and lightning protection zone assessment.
Power Quality Reports: Document power factor, harmonic distortion levels, voltage stability, and transient events. Power factor should be above 0.90 to avoid utility penalties. Total harmonic distortion should be below 5% for voltage and below 8% for current at the point of common coupling per IEEE 519.
Generator and UPS Test Records: Document load bank testing results, automatic transfer switch operation times, fuel consumption rates, and UPS battery discharge tests. Generator load tests should verify rated capacity. Transfer switch operation should complete within 10-15 seconds for life safety loads.
What to Inspect
Check the main switchboard for proper labelling of all circuits. Verify that MCBs and RCDs are correctly rated and not tripped. Look for signs of overheating (discoloration, melted insulation) on connections and busbars. Verify that all distribution boards have circuit schedules. Check for exposed wiring, damaged cable trays, and missing junction box covers. Verify earthing connections at the main earth terminal. Check generator room for test records and fuel level.
Common Gaps in Bangladesh
Many commercial buildings in Dhaka lack periodic inspection reports. Original installation certificates are frequently unavailable for buildings constructed before 2005. Earthing systems may not meet resistance requirements, especially in areas with rocky or dry soil conditions. Generator systems are often installed without proper ATS commissioning documentation. Power quality issues (low power factor, voltage fluctuations) are common but rarely documented. Electrical loading often exceeds original design capacity due to incremental tenant additions without engineering review.
Questions to Ask
- Is the original electrical installation certificate available? What standard was the installation designed to?
- When was the last periodic inspection report conducted? Were all C1 and C2 deficiencies rectified?
- What are the current earth resistance test results? When were they last measured?
- Is the current electrical loading within the designed capacity of the main incoming supply?
- Are generator load test records available? When was the last test?
- What is the power factor at the main incoming supply?
Standards and References
Key standards include IEC 60364 (Low-Voltage Electrical Installations), BS 7671 (Requirements for Electrical Installations, the IET Wiring Regulations), NFPA 70 (National Electrical Code), NFPA 70E (Standard for Electrical Safety in the Workplace), IEEE 519 (Harmonic Control), BS EN 62305 (Protection Against Lightning), and BNBC 2020 electrical provisions. For periodic testing methodology, refer to BS 7671 Part 6 (Inspection and Testing) and the IET Guidance Note 3.