Systems and special applications · Complies to IEC 62561-6 · IEC 61557 · CEA
Monitoring and Record
A protection system is only proven by evidence. Monitoring and record brings together strike counters, SPD and earth monitoring, identification plates and periodic inspection, so that the owner can show when the system was struck, what was checked and that it still performs.
When it applies
- Sites that must show compliance to auditors, insurers or regulators
- Unmanned and remote sites
- Plants where a failed SPD or a broken earth would not otherwise be noticed
- Any LPS due for periodic inspection
When it does not
- A substitute for repairing a non-compliant system — repair first, then monitor
- Sites with no person or system assigned to act on alarms
How the system works
- DefineZones, bonding points and what must be evidenced are fixed on the drawings first.
- SelectEach component is chosen by its rating and the standard it is tested to.
- InstallConnections are kept short and every joint is made with a tested component.
- VerifyThe system is measured, labelled and recorded before handover.
Coordinated surge protection
Each device takes its share. The Class I device diverts lightning current at the service entry; Class II and III devices bring the remaining voltage below what the equipment can withstand.
Design parameters
The values a consultant or contractor needs to fix before the system is drawn.
| Parameter | Typical value or rule | Reference |
|---|---|---|
| Strike counting | Counter on the down conductor or earth lead | IEC 62561-6 |
| SPD status | Remote contacts or monitors on every SPD | IEC 61643-11 |
| Earth monitoring | Continuous or periodic measurement of earth resistance and continuity | IEC 62305-3 Annex D |
| Inspection interval | Visual every year; complete with electrical testing every 3 years; complete every year for sensitive systems, public buildings and explosion-risk structures | IEC 62305-3 D.7.2 |
| After a strike | Inspection after every recorded strike | IEC 62305-3 Annex D |
| Records | Drawings, test values, photographs and the inspection report | IEC 62305-3 Cl. 7 |
| Architecture | Earth, SPD and lightning monitors reporting through one remote terminal unit | LPES system design |
Solution pack: component BOQ
Each line opens the LPES product category. Part codes and final quantities are confirmed on your quote from the drawings.
| Component | Role in the system | Quantity rule |
|---|---|---|
| Lightning Strike Counters | Count and time-stamp strikes | One per LPS, or one per main down conductor |
| SPD Monitoring | Monitor SPD status and report failures | One per board or SPD group |
| Earth Monitoring Systems | Monitor earth resistance and continuity | One per earth system or critical pit |
| Signs, Labels & Identification Plates | Identify down conductors, test joints and pits | One per test joint, pit and bonding bar |
From design to handover
- List what must be evidenced and who receives alarms
- Fit counters, SPD monitors and earth monitors
- Label every test joint, pit and bar
- Set the inspection schedule from the protection level
- Keep the record current after every inspection and every strike
Services for this solution
Annual Maintenance ContractMonitoring SubscriptionPeriodic Inspection & Testing
Industries that use it
What the standards require
Checked against the current editions held in the LPES standards library.
- IEC 62305-4:2024
- A coordinated SPD system protects against conducted surges only. Radiated fields need shielding and cable routing.
- IEC 62305-4:2024 Cl. 7
- Where an external LPS exists, a Class I (Type 1) SPD is required at the service entry.
- IEC 62305-4:2024
- Earthing conductor to the SPD: 16 mm² copper for Class I, 6 mm² for Class II and 1.5 mm² for Class III.
- IEC 62305-3:2024 Tables 9 and 10
- Bonding conductors: 16 mm² copper between bonding bars or to earth; 6 mm² copper from internal metal installations to a bar.
- IS 3043:2026 Cl. 6.3
- One interconnected, meshed earthing and bonding network, with all electrodes, the main earthing terminal and the LPS integrated.
- IEC 62305-3:2024 D.7.2
- Inspect visually every year and completely every three years; every year for sensitive systems and explosion-risk structures.
Regulation and standards cross-check
What Indian regulation and the wider standards add to this solution. Paraphrased; confirm against the current official text, amendments and state notifications before relying on a clause in a tender or inspection.
| Standard | Clause | What it requires |
|---|---|---|
| CEA Safety Regulations 2023 | Reg 43(x), Reg 50(8) | Earthing systems are tested for resistance on a dry day in the dry season at least once a year, and the records are kept for the Electrical Inspector. |
| CEA Safety Regulations 2023 | Reg 32(2), Reg 33(3) | Periodic inspection or self-certification is set by the Appropriate Government at intervals not longer than five years. Test instruments are calibrated by a Government-authorised or NABL-accredited laboratory. |
| CEA Safety Regulations 2023 | Schedule II Forms II and III | Inspection forms ask for two earth connections, the recorded electrode resistance, tested protective bonding, loop impedance at the origin and for each circuit and every source, annual earth resistance measurement, and arresters near transformers. |
| CEA Safety Regulations 2023 | Reg 43(xi), 43(xii) | Earth-fault loop impedance is tested, and each circuit is limited by the type and rating of its protective device so that disconnection happens before touch voltage becomes harmful. Earth test records are kept for at least two years. |
| IEC 60364-6:2016 | 6.5.2 | Periodic verification is typically every few years, for example four. Shorter intervals suit construction sites, communal facilities, sites with both high and low voltage, and workplaces where degradation raises shock, fire or explosion risk. |
| IEC 60364-6:2016 | 6.4.3 | Initial verification tests follow a set order: continuity of conductors, insulation resistance, polarity, automatic disconnection of supply, additional protection, phase sequence and functional tests, using IEC 61557 instruments. |
| IEC 60364-6:2016 | Annex C | Earth electrode resistance is measured by fall-of-potential with auxiliary electrodes, by a loop impedance instrument, or by current clamps where auxiliary electrodes cannot be placed. |
| IEEE Std 80-2013 | Clause 19 | The built grid is verified in the field by fall-of-potential measurement, touch and step voltage surveys and grid integrity tests. The 61.8% probe rule holds only for uniform soil and long traverses. |
| IS 3043:2026 | Clause 12.1.2.1, 13.7 | For lightning protection, a Type A earth electrode targets a resistance below 10 Ω, and the continuity of the lightning protection path is checked against 0.2 Ω. |
What we ask for before design starts
- Single-line diagram with sources, operating modes and earthing arrangement
- Equipment list with impulse withstand levels
- Cable routes and every point where services enter
- Fault levels and protection clearing times
- Existing earthing and lightning protection records
- Site layout with fences, pipes, rails and neighbouring installations
Engineering depth: from the LPES Knowledge Hub
Topic studies written against the current standards. Open each part for the method, the mistakes to avoid and the checklist.
IEC 62305-3:2024 · LPES Knowledge Hub H-47
Maintenance and inspection regime of an LPS
A lightning protection system (LPS) is not a fit-and-forget installation: corrosion, weather, theft, mechanical damage and the lightning strikes it is built to survive all degrade it over time, and every change made to the structure it protects — a new rooftop plant, an extension, a re-roofing job — can silently invalidate the design. IEC 62305-3:2024 answers this with a maintenance and inspection regime built on four ideas: inspect at defined triggers (construction, commissioning, periodically, after alteration, after a known strike); choose the periodic interval from the consequence of failure, the environment and the LPS class; use two depths of inspection — a visual check and a complete check that adds electrical testing — on a cycle that keeps the gap between them bounded; and record everything, because the inspection and maintenance history is itself part of the evidence that the LPS still does what it was designed to do.
How it is applied
- Applying the regime is a sequence of decisions rather than a calculation:
- Establish the inspection triggers that apply regardless of calendar: at construction (for elements about to become concealed), at commissioning, after any alteration or repair to the structure, and after any known or suspected lightning strike.
- Classify the structure against the frequency-driving factors: use, consequential effect of damage, LPS component materials, mounting surface, local atmospheric environment, and soil conditions.
- Select the periodic regime from that classification: general structure → 1-year visual / 3-year complete (or 2-year complete if annual visual is not done); severe weather/mechanical stress, explosion risk, or sensitive/high-occupancy structures → 6-month visual / 1-year complete, with the optional 14–15 month seasonal test cycle.
- Before the physical inspection, check the technical documentation for completeness, conformity to the standard, and agreement with the as-executed plan.
- Carry out the inspection at the depth selected: visual only, or visual plus electrical testing (continuity and earth resistance, plus SPD condition checks).
- Compare the earth-resistance result against the 10 Ω criterion and against the trend from prior inspections; investigate any significant change.
- Record everything — inspection findings, test results and any corrective action — and file it with the LPS design report and prior inspection/maintenance records.
- Close out any deviation found: inform the property owner or designated representative, and repair or upgrade in a timely manner; never conduct any of this work while a thunderstorm threat exists.
Common mistakes
- Treating "periodic" as a fixed calendar interval only, and missing the trigger-based inspections required at construction, at commissioning, after alteration/repair, and after a known or suspected strike (7.4).
- Running only visual inspections indefinitely without ever stepping up to a complete (electrically tested) inspection at the required 2- or 3-year cap.
- Failing to reduce the interval when the environment changes — for example, a nearby demolition or new road introducing de-icing salt exposure, without revisiting the "local environment"/soil factors in D.7.2.2.
- Not linking building changes (a new rooftop unit, an extension, an added antenna or a re-purposed floor) back into the LPS design — objective (c) in 7.3 exists precisely because this link is often missed.
- Skipping the technical-documentation review (D.7.2.3) and going straight to the physical walk-down, which risks inspecting against an outdated or incomplete design record rather than what was actually built.
- Treating a single earth-resistance reading in isolation instead of tracking the trend across successive inspections, missing a developing corrosion or degradation problem that the standard specifically asks to be investigated.
- Conducting inspection, testing or maintenance work during a thunderstorm threat — an explicit safety requirement in 7.1, not a scheduling nicety.
- Assuming an SPD with no visible fault indicator is therefore healthy, instead of testing it as D.7.3 requires.
- Losing continuity between design, inspection and maintenance records — D.7.4 expects one connected record set, not scattered or missing paperwork that cannot support a trend review.
Design checklist
- Confirm which inspection trigger applies: construction stage, post-installation, periodic, post-alteration/repair, or post-strike.
- Confirm the structure's frequency classification: general, or severe-weather/mechanical-stress/explosion-risk/high-consequence.
- Confirm the current inspection is due at the correct point in the visual/complete cycle for that classification.
- Review technical documentation for completeness, standard conformity and as-built agreement before the site visit.
- Carry out the visual inspection scope in full where a visual-only inspection is due.
- Add continuity testing and earth-resistance measurement where a complete inspection is due.
- Check SPDs without a visual indicator using manufacturer test guidance.
- Compare the earth-resistance reading against the 10 Ω criterion (or D.5.4.3.5 for rocky soil) and against the trend of prior readings.
- Record findings, test results and any required corrective action, and file with the design report and prior inspection/maintenance records.
- Report any observed deviation to the property owner or designated representative and track it to timely repair.
- For structures with a risk of explosion, confirm the additional requirements of Annex C.5 / IEC 60079-17 have been considered and that the inspector has, or is assisted by, the relevant hazardous-area competence.
- Never schedule or perform inspection, testing or maintenance activity during a thunderstorm threat.
IEC 62305-4:2024 · LPES Knowledge Hub H-23
Inspection and maintenance of SPM
A surge protection measure (SPM) — the earthing and bonding network, the shielding and line routing, and the coordinated SPD system installed under IEC 62305-4 — is only as good as the last time someone checked it. Clause 9.3 and 9.4 of IEC 62305-4:2024 set out how that checking is done: inspection combines a documentation check, a visual walk-down and, where needed, test measurements, carried out at fixed points in the SPM's life (during installation, after installation, periodically, after any alteration, and possibly after a lightning event) at a frequency the owner sets based on the local environment and the type of measure installed; the inspector records everything in a report attached to the technical documentation; and any defect found is corrected without delay, with the documentation updated to match. It is the maintenance loop that keeps a designed SPM an installed and working SPM.
How it is applied
- Set the inspection trigger calendar for a given structure by combining the five mandatory trigger points (during installation, after installation, periodic, after alteration, possibly after a flash) with a periodicity chosen from the local environment and protection-measure type, defaulting to IEC 62305-3:2024 Clause D.7 guidance where no local authority requirement exists.
- Before any inspection, assemble or update the inspection guide so the inspector has a defined checklist of components, test methods and test equipment to record against — this converts 9.3.3's "should" into something usable on site.
- Run the documentation check (9.3.2.1) first: confirm the current technical documentation matches what is actually installed, flagging any undocumented alteration or extension before moving to the physical walk-down.
- Run the visual inspection (9.3.2.2) against its eight listed items in order: connections and joints; corrosion (especially at ground level); bonding conductor and cable shield continuity; bonding of metal parts; unprotected additions; SPD/fuse/disconnector damage indicators; line routing; and safety distance compliance to the documented spatial shield layout.
- Where a parameter cannot be confirmed visually, take the measurement: continuity testing on hidden earthing/bonding parts, and manufacturer-specified measurement on any SPD lacking a status indicator; fold the SPD test programme into the same procedure as the IEC 62305-3:2024 Clause C.6/D.7 inspection so the two systems (LPS and SPM) are checked together, not as separate exercises.
- Close the loop: write the inspection report with all seven mandatory contents, attach it to the technical documentation and to the run of previous reports (so trends over time are visible), then correct every noted defect without delay per 9.4 and update the technical documentation if the correction changed anything material.
Common mistakes
- Treating "periodic inspection" as the only trigger and skipping the mandatory during-installation, after-installation, after-alteration and possible post-flash inspections that 9.3.1 lists as equally mandatory.
- Relying on a fixed inspection interval from another project without redetermining it against this structure's own local environment and protection-measure type, as 9.3.1 requires.
- Skipping the documentation check (9.3.2.1) and going straight to the visual walk-down, so an undocumented alteration is never surfaced and the "SPM complies with the design" verification objective is not actually met.
- Assuming an SPD is healthy because it looks physically undamaged, without performing the manufacturer-specified measurement required whenever it lacks a status indicator (9.3.2.3).
- Running the SPD inspection programme as a separate exercise from the IEC 62305-3:2024 LPS inspection under Clause C.6/D.7, duplicating effort and risking inconsistent findings, when the standard directs they be incorporated into one procedure.
- Producing an inspection report that omits one of the seven mandatory contents (commonly: omitting the inspector's name or the explicit list of deviations from documentation), which breaks the audit trail 9.3.3 is designed to create.
- Deferring correction of a noted defect ("we'll fix it at the next scheduled visit") instead of correcting it without delay as 9.4 requires, leaving the structure with a documented but unaddressed protection gap.
Design checklist
- Inspection guide prepared and covers every component, test method and item of test equipment relevant to this SPM.
- Inspection scheduled or triggered for all five occasions: install, post-install, periodic (frequency set from environment + measure type, or IEC 62305-3:2024 D.7 default), post-alteration, possible post-flash.
- Technical documentation checked for compliance and completeness against the as-built SPM (9.3.2.1).
- All eight visual-inspection items checked and recorded (9.3.2.2).
- Continuity measured on hidden earthing/bonding parts; SPD operating status measured per manufacturer instructions wherever no status indicator exists (9.3.2.3).
- SPD inspection programme incorporated into the IEC 62305-3:2024 Clause C.6/D.7 procedure, not run separately.
- Inspection report written with all seven mandatory contents and attached to the technical documentation and the run of previous reports.
- All noted defects corrected without delay; technical documentation updated if the correction changed anything material (9.4).
Try the numbers
Protection level explorer
- Rolling-sphere radius
- 45 m
- Mesh size
- 15 × 15 m
- Down-conductor spacing
- 15 m
- Peak current covered
- 100 kA
- Coefficient ki
- 0.04
- Interception efficiency
- 90%
Values from IEC 62305-1 and IEC 62305-3. The level for your structure comes from the risk assessment.
What we find on audits
- Bonding done at the board but not where services enter the building
- Type 2 devices used where a Type 1 is required
- Isolating joints and insulated flanges left without spark gaps
- Monitoring fitted with nobody assigned to act on alarms
- Records kept by the contractor and never handed to the owner
What you receive: the LPES Protection Passport
- As-built drawings of the installed system
- Risk assessment and design calculations
- Test results: earth resistance, continuity, SPD checks
- Component list with part codes and type-test references
- Inspection schedule for the protection level
Lightning to Load: one accountable partner
- Assess
- Design
- Specify
- Supply
- Implement
- Verify
- Assure
Standards basis
IEC 62305-3 and -4:2024 (Ed. 3) · IEC 61643 series · IEC 60364-6:2016 · IS 3043:2026 · IS 732:2019 · IEC 62561 series · IS 732:2019 · IEC 60364-6:2016 · IEC 61936-1:2021
Reviewed by LPES engineering, November 2026. Clause and table numbers follow IEC 62305:2024 (Edition 3) and IS 3043:2026.
Questions engineers ask
Why fit a lightning strike counter?
It shows that a strike occurred, which triggers an inspection and supports insurance and audit records. Lightning Strike Counters
How often must an LPS be inspected?
A visual inspection every year and a complete inspection with electrical testing every three years. Sites with sensitive systems, crowds or explosion risk need the complete inspection every year. Periodic Inspection & Testing
Can earth resistance be monitored continuously?
Yes, with an earth monitoring system that measures and reports the value and alarms on change. Earth Monitoring Systems
What records should the owner hold?
As-built drawings, test results, photographs and each inspection report. Annual Maintenance Contract
Can monitoring be provided as a service?
Yes, under a monitoring subscription with reports and alarm handling. Monitoring Subscription
Get this solution quoted for your site
Send the drawings or the basic dimensions. LPES returns the design parameters, the BOQ with part codes and the price in one offer.
