Pole loading analysis

Pole loading analysis confirms whether an existing utility pole can safely carry a new attachment — a fibre cable, splice closure, or any added equipment. It’s standard practice for any aerial fibre build in the US, required by pole owners and the National Electrical Safety Code (NESC) before attachment is permitted.

We deliver pole loading analysis using O-Calc Pro and SPIDA Calc, the two industry-standard tools that pole owners accept. Inputs come from field data — measurements, photos, equipment lists, and the ice and wind district per NESC. Output is a per-pole report identifying which poles pass as-is and which require make-ready work before attachment.

Why pole loading analysis is required

Three layers of regulation make pole loading analysis a hard prerequisite for aerial attachment, not an optional check.

1. NESC. The National Electrical Safety Code divides the US into loading districts (Heavy, Medium, Light, plus Warm Islands for southern coastal areas) based on expected ice and wind conditions. NESC Rule 261 sets the structural requirements for poles under combined dead load (the pole, equipment, cables) and live load (ice and wind per district). Per Table 261-1 in NESC 2017, a pole is treated as passing where structural loading is within 85% of allowable in most use cases.

2. Pole owner specifications. Most US pole owners (electric utilities, telecoms, joint-use partnerships) layer their own structural and clearance specifications on top of NESC. Loading analysis has to satisfy both. We work to the format requirements of the major US pole owners and follow each owner’s submission standards.

3. FCC pole attachment framework. Under the FCC’s pole attachment rules, attachment requests are subject to a 148-day review timeline. Loading analysis sits within that timeline and feeds make-ready engineering for any failures.

Clearances and the communication zone

Fibre attachments to utility poles aren’t just structural — they’re spatial. NESC Rule 235 governs clearances between attachments. Key constraints:

• Communication cables typically attach in the communication zone, 18’–23’ above ground.
• A 40-inch separation is required between communication cables and supply conductors above (NESC 2017 Rule 235, Table 235-5).
• Drip loops, risers, and service drops have their own clearance rules.

Where existing attachments have crept out of clearance over years of accumulation, the new attachment may require make-ready work to restore clearances even if the pole passes structurally.

What’s in a pole loading analysis

A complete analysis covers the same set of components per pole:

• Pole specification — height, class, species (wood) or material spec
• Existing attachments — every cable, transformer, crossarm, and piece of equipment, with weights and attachment heights
• Existing guying — anchor types, lead lengths, guy specifications
• Proposed attachment — the new fibre cable, attachment height, equipment additions
• Loading calculation — combined dead load, live load per NESC district, calculation against pole capacity
• Clearance check — vertical and horizontal clearances per NESC 235
• Pass / fail determination — including the percent loading and which constraint(s) drive failure
• Make-ready scope for failed poles — transfer, raise, replace, or guy

Inputs we need

Pole loading analysis is only as good as the field data it runs on. Bad inputs produce confidently-wrong analysis. We work from:

• Field-collected pole data — height, class, species, ground line photos
• Existing attachments — measurements, equipment lists, attachment heights
• Existing guying — types, anchor positions, lead lengths
• Geographic context — NESC loading district, soil conditions if relevant
• The proposed attachment spec — cable type, weight, attachment height, additional equipment

Where the client has field data already (most common for organised surveys), we build from that. Where field data is incomplete, we identify the gaps and either request a re-walk or work with engineering judgement caveats clearly flagged in the report.

Tools we use

We model in O-Calc Pro and SPIDA Calc, the two industry-standard structural analysis tools accepted by US pole owners. The choice between the two is usually driven by what the pole owner wants — most owners accept either, some have preferences, a few specify only one.

Both tools produce structured analysis output that pole owners can re-run and audit independently. We deliver model files alongside the report so that’s possible.

Output formats and pole-owner submission

Output for the client is a per-pole report with pass / fail determination, percent loading, photos, and make-ready scope where applicable. The submission package to the pole owner follows their format — typically a combination of the structural model file, a summary report, and the field photos.

Where the pole owner uses a permitting platform (Pole Foreman, Alden, custom systems), we work in their platform. Where submission is by email or PDF package, that’s how we deliver.

The handoff to make-ready engineering

Most projects find some poles that fail loading or clearance. For those poles, the analysis identifies the work needed — transfer existing attachments, raise the pole, replace it, or add guying. That scope feeds directly into our make-ready engineering service, where we design the actual remediation work, get pole owner approval, and hand off a buildable scope to the construction crew.

We run pole loading and make-ready as one continuous engagement rather than separate procurements when the project warrants it. Single team, single dataset, no rework between phases.

Common pitfalls in outsourced pole loading

Three issues come up consistently in pole-loading work that’s outsourced poorly:

Field data quality. If the field walkout was rushed or the surveyor didn’t capture full attachment lists, the analysis can’t compensate. We flag known data gaps in every report rather than papering over them.

Stale NESC version. NESC updates every five years. A pole loading analysis run against NESC 2012 when the pole owner has moved to NESC 2023 will be rejected. We work to the version the pole owner currently requires.

Generic pole owner format. Each pole owner has format quirks — title block layouts, required attachments to the report, specific call-outs for make-ready scope. Generic outputs get rejected. We build per-owner templates and use them.

If any of these have caused friction on a previous engagement, ask about how we handle them on a scoping call.

Typical timelines

Engagement size and timeline scale together:

• Up to 100 poles — 2-3 weeks from field-data delivery to per-pole reports
• 100-500 poles — 3-6 weeks
• 500-2,000 poles — 6-12 weeks, often phased
• 2,000+ poles — programme work, typically run in rolling batches with monthly delivery

These timelines assume clean field data. Where field data needs re-walking or significant validation, add 2-4 weeks at the front.

How we deliver

Pole loading analysis runs on our integrated UK-and-offshore model — production analysis happens within our offshore team, with onshore review and quality control before any deliverable goes to the pole owner. The arrangement keeps cost competitive while preserving the engineering review layer that catches issues before they reach a pole owner’s submission desk.

Every report goes through a senior reviewer who’s run pole-loading work directly. NESC interpretation and pole-owner-specific adjustments are not delegated to junior staff.

Talk to us about a pole loading project

Tell us how many poles, where they are (NESC district), what the proposed attachment is, and what pole owner is approving. We’ll come back with scope, price range, and timeline. For projects under 500 poles, we typically respond within two business days; for larger programmes, a scoping call is usually warranted.