• Network Installation Condition Report

    Electrical Safety

  • Job Details

  • Date of Inspection*
     - -
    2 digit month, 2 digit day, 4 digit year
  • Format: (000) 000-0000.

  • 1- Identify and Record Supply

    Establish incoming supply type and any additional supply sources — ESQCR 2002 / EAWR 1989 / ENA G12/4
  • DNO Service Head Type*
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  • Primary Supply Characteristics

  • TN-S (Separate neutral and protective conductor)
  • TN-C-S / PME (Combined neutral and earth)
  • TT (Earth electrode required at premises)
  • IT (Isolated from earth or high impedance)
  • Secondary / Tertiary Supply Sources
    • REGULATORY REFERENCES 

    • Electricity Safety, Quality and Continuity Regulations (ESQCR) 2002

      DNO must maintain safe service heads, earthing, PEN conductors, and supply continuity. Requires DNO to ensure PME earthing is safe and neutral integrity is maintained.

      Electricity at Work Regulations (EAWR) 1989

      Reg 4: Systems must be constructed and maintained to prevent danger. Reg 8: Equipment must be protected from mechanical damage. Reg 14: Work near live conductors must prevent danger.

      ENA ER G12/4 – Requirements for LV Service Equipment

      Defines acceptable service head types. Specifies resin head construction, metal clad legacy equipment, sealing requirements. Defines inspection criteria for deterioration.

  • 2- Test for Unintended Energisation

    Hazard check — prove contact voltage indicator on known live source first — EAWR Reg 14 / ENA G12/4
  • ⚠
    Before testing: Prove your contact voltage indicator on a known live source. Test the front, sides, and cable entry points of the service head. If voltage is detected — stop work immediately and call DNO on 105.
  • Was voltage detected on the service head / enclosure?
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    • REGULATORY REFERENCES 

    • EAWR Reg 4(3)

      Test equipment must be suitable and effective. EAWR Reg 14 — Must not expose persons to danger from live conductors.

      BS 7671 Section 13 & Part 6

      Fundamental principle: protection against electric shock. Verification procedures for confirming dead.

      IET Guidance Note 3

      Proving your tester on a known live source. Testing for dangerous voltages on enclosures.

      ENA G12/4

      If a service head is energised externally → IMMEDIATE DNO ATTENDANCE required.

      ENA Safety Bulletin SB PEN 01

      External energisation may indicate PEN failure. Requires urgent neutral integrity investigation.

      DNO Safety Rulebooks (all UK DNOs)

      "If any part of the service head is live, STOP WORK and REPORT." Photographic evidence must be taken. Do not touch or attempt to reseal.

  • 3- Inspect DNO Head for Physical Defects

    Look for visual signs of deterioration or dangerous conditions — ENA G12/4 / BS 7671 S421 / GN3

  • 3.1 Tracking, Carbonisation & Surface Damage

    Test for tracking according to ENA G12/4 inspection criteria. Tracking is a precursor to flashover.

  • Carbonisation present (black deposit, carbon trails)
  • Scorch patterns observed (sustained overload indicator)
  • Pitting or etching on surfaces
  • Moisture-related signs (condensation, rust, staining)
  • Are pieces missing from the head? (add comment if needed)
  • Are pieces missing from the meter”? (add comment if needed)

  • 3.2 Structural & Insulation Condition

  • Deformation of enclosure or components
  • Heat damage visible
  • Melted insulation (BS 7671 S421 — fire risk)
  • Cracks in resin or porcelain (metal clad heads)
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    • REGULATORY REFERENCES 

    • EAWR Reg 4(2)

      Equipment must be maintained to prevent danger. EAWR Reg 6 — Electrical systems must be constructed to prevent fire.

      BS 7671 Section 421

      Protection against fire caused by electrical equipment. Section 526 — Integrity of connections and insulation.

      GN3 Inspection Items

      Signs of overheating, burning, tracking, insulation breakdown.

      ENA G12/4 — Mandatory Inspection Points

      Carbonisation · Tracking · Heat damage · Melted insulation · Cracked resin · Porcelain breakdown (metal clad heads)

      ENA Safety Alerts

      Tracking is a precursor to flashover. Carbonisation indicates imminent failure. Scorch patterns indicate sustained overload.

  • 4- Measure Current on Earth Conductors

    Identify diverted neutral currents or PEN fault indicators — ENA SB PEN 01 / BS 7671 S542

  • Use a clamp meter on the main earth conductor. Record standing current. Note any fluctuations — earth currents >30 mA may indicate diverted neutral (ENA SB PEN 01).

  • 4.1 Reading Fluctuating?

  • Fluctuating / unstable reading
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    • REGULATORY REFERENCES 

    • ESQCR Reg 8

      DNO must maintain neutral integrity. EAWR Reg 4 — Must prevent danger from diverted neutral currents.

      BS 7671 Section 411 & 542

      Shock protection, earthing integrity, and earthing arrangements.

      ENA Safety Bulletin SB PEN 01

      Earth currents >30 mA may indicate diverted neutral. Fluctuating earth currents strongly indicate PEN instability. Requires urgent DNO attendance.

      ENA G81

      PME systems must not exhibit dangerous neutral imbalance. Clamp meter readings must be recorded. High or fluctuating readings → escalate immediately.

  • 5- Prove Non-Contact Voltage Indicator & Check Main Earth for Voltage

    Instrument verification and main earth conductor voltage check — EAWR Reg 4(3) / BS 7671 Part 6 / IET GN3
  • ⚠
    Step 1 – Prove your non-contact voltage indicator (NCV) is functioning correctly: Before using your NCV indicator on the main earth conductor, prove it is working by holding it near a known live source (e.g. a standard 230 V socket outlet). The indicator must illuminate or audibly signal. If it does not respond, the instrument must not be used — replace or substitute before proceeding.

    Step 2 – Test the main earth conductor for voltage: A dual-band NCV indicator will illuminate at approximately 12 V and above. Any illumination on the main earth conductor indicates voltage is present and must be treated as a dangerous condition requiring immediate escalation.

  • 5.1 NCV Indicator Proving Check

  • NCV indicator proved on known live source (230 V) prior to earth test?*

  • 5.2 Main Earth Conductor Voltage Check

    Hold dual-band NCV indicator against the main earth conductor. Illumination at the 12 V band or above indicates dangerous voltage on the earth — this may indicate a broken or elevated PEN conductor.

  • Was voltage detected on the main earth conductor? (NCV indicator illuminated — >12 V threshold)*
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    • REGULATORY REFERENCES 

    • EAWR Reg 4(3)

      Test equipment must be suitable, in good condition, and proven effective before use. An unverified instrument must not be relied upon.

      BS 7671 Part 6 — Inspection and Testing

      All test instruments must be verified as functional before use. Results are only valid where the instrument has been proved on a known source.

      IET Guidance Note 3 (GN3)

      Instruments must be proved on a known live source before and after use. A dual-band NCV indicator operating at 12 V provides an early warning of voltage on protective conductors well below the 50 V safe threshold.

      ENA Safety Bulletin SB PEN 01

      Voltage appearing on earthing and bonding conductors is a strong indicator of PEN conductor failure. Any voltage on the main earth — even at low levels — must be treated as a dangerous condition requiring immediate DNO notification.

      ENA G81 / ESQCR 2002

      PME earth conductors carrying voltage indicate neutral imbalance or failure. Escalate to DNO immediately. Do not continue work until the supply has been confirmed safe.

       

  • 6- Document Cable Condition and Routing

    Ensure all incoming and outgoing cables are safe and compliant visually — EAWR Reg 4 / BS 7671 S526
  • Cables Inspected*
  • Could cable arrangements be improved? (termination, strain relief, routing)
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    • REGULATORY REFERENCES 

    • EAWR Reg 4(3)

      Test equipment must be suitable, in good condition, and proven effective before use. An unverified instrument must not be relied upon.

      BS 7671 Part 6 — Inspection and Testing

      All test instruments must be verified as functional before use. Results are only valid where the instrument has been proved on a known source.

      IET Guidance Note 3 (GN3)

      Instruments must be proved on a known live source before and after use. A dual-band NCV indicator operating at 12 V provides an early warning of voltage on protective conductors well below the 50 V safe threshold.

      ENA Safety Bulletin SB PEN 01

      Voltage appearing on earthing and bonding conductors is a strong indicator of PEN conductor failure. Any voltage on the main earth — even at low levels — must be treated as a dangerous condition requiring immediate DNO notification.

      ENA G81 / ESQCR 2002

      PME earth conductors carrying voltage indicate neutral imbalance or failure. Escalate to DNO immediately. Do not continue work until the supply has been confirmed safe.

       

  • 7- Record Additional Earthing and Bonding

    Verify presence and condition of all earthing components — BS 7671 S542 / GN3 / ENA G81
  • Was a secondary earth electrode present?
  • Are pieces missing?
  • Earth Electrode Type
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    • REGULATORY REFERENCES 

    • BS 7671 Section 542

      Earthing arrangements and protective conductors. Ra must be ≤200 Ω for TT systems (BS 7671 Reg 411.5.3).

      BS 7671 Section 411.3.1.2

      Main protective bonding conductors required to gas, water, structural steel within 600mm of meter point.

      GN3

      Earth electrode resistance measurement procedures. Fall of potential method preferred.

      ENA G81

      Earthing requirements for PME supplies. DNO earth electrode connection conditions.

  • 8- Dangerous Conditions — Summary and Action

    Code C1 / Immediate Danger Assessment — BS 7671 / EAWR / ESQCR

  • 8.1 Escalation condition

    All of these conditions should be reported to the DNO immediately on 105

  • Energised head / enclosure (external voltage present)
  • High or fluctuating earth current (>30mA / unstable)
  • Severe tracking / carbonisation (ENA G12/4)
  • Major heat damage or deformation
  • Cracked head with moisture ingress
  • Neutral / earth integrity compromised (PEN concern)
  • Tampered / missing seals with unsafe modifications

  • 8.2 Log your call to the DNO here

  • Time of call
     - -
    2 digit month, 2 digit day, 4 digit year
    • REGULATORY REFERENCES 

    • BS 7671 — Code C1 (Danger Present)

      Immediate remedial action required. The inspector must advise the duty holder in writing not to use the installation until defects are remedied.

      EAWR Reg 4 & 16

      Persons must not carry out work where danger would arise. Competent persons must recognise limits of their competence.

      ESQCR 2002

      Defective DNO equipment must be reported. DNO must respond to safe supply requirements.

       

  • Declarations & Signatures

  • I confirm that the inspection described in this report was carried out in accordance with BS 7671, EAWR 1989, and applicable ENA codes of practice, to the best of my knowledge and ability, and that the results are accurately recorded.

  • Electrician / Inspector Signature Date*
     - -
    2 digit month, 2 digit day, 4 digit year
  • Client / Duty Holder Signature Date
     - -
    2 digit month, 2 digit day, 4 digit year
  • Should be Empty: