A pole comes down: who has to prove it was maintained?
7 min read
If a pole on your overhead line comes down across a road, it is not for the injured party to prove it was rotten: it is for you to prove it was not. And by then the pole has gone — removed the same night to reopen the carriageway. What is left is what somebody wrote down years earlier: a date, an item, a number with its unit. If that line was never put into the specification, that sheet does not exist.
The proof the civil code asks you for
Article 2053 of the Italian civil code, headed Rovina di edificio, collapse of a building, runs to a single line: “Il proprietario di un edificio o di altra costruzione è responsabile dei danni cagionati dalla loro rovina, salvo che provi che questa non è dovuta a difetto di manutenzione o a vizio di costruzione” — the owner of a building or other structure is liable for damage caused by its collapse, unless he proves that the collapse was not due to a lack of maintenance or to a defect of construction. In force since 19 April 1942. The weight sits in that unless he proves: the proof is not owed by the injured party, it is owed by you.
Beside it sits article 2051: “Ciascuno è responsabile del danno cagionato dalle cose che ha in custodia, salvo che provi il caso fortuito” — everyone is liable for damage caused by the things in their keeping, unless they prove it was a fortuitous event. On a network maintained under contract by somebody else, owner and keeper are not the same party: a specification that does not say who inspects, how often and to what measure leaves both of them exposed.
What gets looked at, material by material
The list of items exists, and it is public: Recommendation ITU-T L.341, Maintenance of telecommunication poles and overhead facilities, edition 2.0 approved on 14 May 2025 by Study Group 15, in force, with a PDF free to download. The Summary states what changed: “Previous editions dealt with inspection methods for wooden poles” — earlier editions covered inspection methods for wooden poles — while this one also covers concrete, steel and glass-reinforced plastic.
Mind how you cite it. The ITU record today lists two in-force components under the same number: 05/25, and the older L.341 (07/10), which carries a different title — Management of poles carrying overhead telecommunication lines, formerly L.88, renumbered in 2016. Writing compliant with ITU-T L.341 without the edition points at two different texts.
Table 1 asks, for every pole, deflection, surface damage, sinkage and tilt. After that it varies with the material: cracks apply to concrete, wood and glass-reinforced plastic, but not to steel, which has rusting and thickness in their place; bending belongs to concrete alone; on glass-reinforced plastic, surface damage includes peeling paint. But the part that produces proof is the two notes under the table. Note 1: “Deflection at a given height (e.g., 5 m) above ground level is measured with an accuracy of 1 cm”. Note 2, for cracks and thickness: “Measured with an accuracy of 0.1 mm at the bottom (close to the ground) and the middle of each pole”. Not check the pole: two fixed points, two accuracies. The frequencies sit in L.330 instead.
Not just the pole: everything hanging off it
Table 2 does the same for overhead plant, and at that point it is already a specification. Guy-line: diameter, rusting, guy guard, excess sagging, ground lifting on the anchor side. Suspension wire: insufficient ground clearance and offset distance, rusting, contact with other objects. Aerial and drop cable: cracks, excessive bending, twist. Aerial closures and metallic accessories: loosening, rusting, cracks.
Ground clearance comes back under precise inspection because it changes on its own: sag grows when a load is added or a hard winter goes by, and nobody notices until something tall passes underneath. The tools are listed, and they are ordinary enough that nobody thinks to write them down: “Rod length of 6 m or more can be adopted” — a measuring rod 6 m long or more may be used — and “The use of binoculars is preferred” — binoculars are the preferred means.
The threshold between repair and replacement
Clause 6.4 says when you repair and when you rebuild. Concrete with mild to moderate cracking: a metal plate wrapped and tightened around the pole, or pressurised epoxy resin injection, which has an entry threshold: “First, check that the crack width is 0.2 mm or more”. Steel: a rust inhibitor only where corrosion is mild and there are no holes, and the rust “should be scraped off and checked for holes” — should be scraped away, and the surface then checked for holes. Glass-reinforced plastic: filler and stacked material, rebuilding where the crack puts strength in doubt.
Wood, the hammer and the hole to be plugged
Annex A, an integral part of the Recommendation, describes wooden pole inspection as manual work. The hammer comes first: percussion tells sound timber from hollow by the sound and the rebound, from the base up to arm height. Where the sound changes, in goes the drill probe, which extracts a radial sample; depth and thickness of sound wood are read off two graduated gauges. And then the line that separates a useful inspection from damage: “the holes made with the drill must be sealed with wooden pegs of creosoted wood”.
If doubt remains the pole is unearthed, digging “a hole with enough depth about 50 cm” — a hole of sufficient depth, about 50 cm — to inspect, re-protect and recompact. Appendix I, the Spanish experience, says why exactly there: the preservative action of creosote drops below its threshold after roughly ten years in service, and fungal attack concentrates from 40 cm below the earth line to 50 cm above it.
The foundation can be measured without reopening the trench
Annex B is the part that matters to whoever accepts the work. An accelerometer on the side of the pole, a horizontal blow, a Fourier transform of the free vibration: the first resonance peak rises where the foundation is sound and falls where it is weak. Appendix II reports Korean measurements on 7 m spun-cast concrete poles embedded 1.2 m: loose sand 1.5 kHz, moderately compacted 2.0 kHz, dense 4.0 kHz, crushed stone 4.0 kHz, concrete 4.0 kHz. Badly compacted backfill and properly compacted backfill can be told apart years later, breaking nothing: a check you can insist on at acceptance, if somebody wrote it down first.
What we do not know
L.341 is an international recommendation: compliance is declared voluntary, and we found no Italian technical rule setting inspection intervals for telecommunication poles. We do not know whether a judge would treat a pole as the “altra costruzione”, the other structure, of article 2053: we report the wording of the code, not a ruling. And the Korean figures come from a trial on one precise type of pole: the Recommendation warns that your own reference values have to be established first.
Two threads, applied
First thread: the items in Tables 1 and 2, the accuracies of 1 cm and 0.1 mm, the two measuring points and the 0.2 mm threshold become lines in the maintenance specification and checks at acceptance, with testing and documentation handed over with the work — on new pole routes as on the ones that carry another operator’s cable.
Second thread: the findings — pole, date, item, measurement, countermeasure applied — do not stay on scattered sheets. With CSIDIA, the group’s other company, they become a single map of the network on which an AI runs the diagnosis and the crew closes the fault: repeated at the same point, a crack that is growing separates from one that is not, and the order of work gets calculated rather than argued. Within the client’s perimeter, on-premise or a dedicated cloud with a data centre in Italy, with our own crews and no subcontracting.
For how many of your poles does a measurement exist today, with a date and a unit? Talk to an engineer: the site visit is at no cost, and the list of items to put into the specification stays yours whatever you decide next.