From Survey to Solution: How Power-View Is Transforming Pole Loading Analysis

Published by GridIntel | Bitwise Vids Series

Distribution poles are the backbone of the modern power grid — carrying energized conductors, telecom lines, transformers, and hardware through rain, ice, and high winds. But beneath that familiar silhouette lies a complex structural engineering problem: is that pole strong enough to stay standing?

In the latest episode of Bitwise Vids, GridIntel Application Engineer Tyler Serrett and Director and Co-Founder Dr. Nathan Wallace, PE break down how Power-View — GridIntel’s geospatial asset and project management platform — is bringing pole loading analysis under one roof, from initial field survey all the way through to construction management.

What Is Pole Loading Analysis?

Pole loading analysis is the engineering process of determining whether a utility pole can withstand the combined physical forces acting on it without failing. Think of a distribution pole as a vertical cantilever beam, fixed at or below the ground surface, with loads applied at various heights along its length. The question the analysis must answer is simple but critical: will it stay up, or will it snap?

As Dr. Nathan Wallace puts it: “Think of it as weight and forces that can occur on the pole — is the pole going to, under different load conditions, stay up, or is it going to fall over and snap? Think of it like a toothpick.”

Poles face a combination of forces including:

• Vertical (gravity) loads from the weight of conductors, hardware, transformers, and the pole itself
• Transverse (horizontal) loads from wind pressure on conductors, the pole body, and attached equipment
• Longitudinal loads from unbalanced conductor tension at dead-end or angle structures
• Torsional loads from asymmetric attachment configurations

When these forces are combined and applied at height, they generate a bending moment — a rotational force that tries to snap the pole at its weakest point. That weakest point, in nearly every case, is at or just below the ground surface.

Understanding Ground Line Moment

The most critical metric in pole loading analysis is the Ground Line Moment (GLM) — also called the resultant moment at the groundline. This is the cumulative bending force acting at the base of the pole, where the pole transitions from embedded in the earth to free-standing above it.

Why the Ground Line?

Because this is where the lever arm is longest. Every load applied to the pole — whether it’s a conductor 30 feet up or a transformer at the pole top — multiplies by the distance between its point of application and the ground. A relatively modest horizontal force high up on a tall pole can produce an enormous moment at its base. The ground line is where all of those individual moments sum together, and it’s the location most susceptible to failure.

How GLM Is Calculated

The Ground Line Moment is the vector sum of all individual moments contributed by each attached component:

GLM = Σ (Force × Height above ground)

For each attached item — energized conductors, telecom cables, streetlights, transformers, guys, and the drag of the pole body itself — engineers must account for:

• The magnitude of the force (lbs or Newtons)
• The direction of the force (transverse, longitudinal, or combined)
• The height at which it is applied above the groundline (ft or meters)

When analyzed in three dimensions, the resultant moment has both a magnitude (how much bending force) and a direction (which way the pole is being pushed to fail). This is where the polar coordinate diagram Nathan references in the episode becomes so valuable — it allows engineers to visualize not just whether a pole is overloaded, but which direction the net force is acting and by how much it exceeds the pole’s rated capacity.

Comparing GLM to Pole Capacity

Every wood distribution pole is assigned a class (e.g., Class 1 through Class 7, or H-class for heavy-duty), which defines its minimum fiber stress at the groundline and its ultimate resisting moment. The ANSI O5.1 standard governs these classifications for wood poles.

The analysis outcome is typically expressed as a percent of allowable capacity:

• < 100% — Pole is within acceptable limits
• 100% – 115% — Pole may be acceptable depending on utility policy and load case
• > 115–120% — Pole is overloaded and requires mitigation

Different load cases — National Extreme Ice with Concurrent Wind (NESC Grade B), High Wind, or custom utility-defined cases — produce different GLM values, and each must be evaluated independently.

The Three-Step Process in Power-View

As Dr. Wallace walks through in the episode, pole loading analysis in Power-View follows a clean, integrated three-step workflow.

Step 1: Data Collection in the Field

Before any analysis can occur, accurate field data must be captured. For brownfield (existing infrastructure) scenarios, this means surveyors must document:

• Pole class and species — defines the pole’s structural capacity
• Total pole length and height above ground — determines effective embedment and available moment arm
• Conductor heights — for each wire, energized or telecom, measured at the pole
• Equipment inventory — transformers, cutouts, streetlights, and other hardware
• Span lengths and directions — needed to calculate conductor tension and wire weight
• Attachment heights — exact heights of all attaching entities above ground

In Power-View, this data collection happens directly within the platform. Rather than paper-based field forms or disconnected mobile apps, surveyors capture everything in a single geospatial integrated environment — eliminating transcription errors and ensuring data flows seamlessly into the next step.

Step 2: Automated Loading Analysis

Once field data is captured, Power-View performs the structural analysis. As Dr. Wallace describes, the tool models the forces at the base of the pole using a polar coordinate representation — viewing the pole from above, with the pole at the origin and forces radiating outward in the direction they act.

The platform simulates multiple load cases simultaneously, including combinations of wind direction, ice loading, and temperature-dependent conductor sag and tension. For each case, it computes:

• Individual component moments and their directions
• The vector-summed resultant GLM
• Comparison against the pole’s rated capacity based on its class
• The percent loading — how close the pole is to its limit

If the resultant moment vector exceeds the capacity circle on the polar diagram, the pole is overloaded in that load case. Power-View immediately identifies the angle of maximum stress and the magnitude of exceedance — giving engineers a precise picture of the failure mode, not just a pass/fail flag.

Step 3: Mitigation Planning and Construction Management

With the analysis complete, Power-View facilitates the third and most actionable step: determining what to do about it.

Common mitigation strategies include:

• Pole replacement — swapping to a higher-class or taller pole to increase capacity or reduce moment arms
• Pole reinforcement — installing a pole-top extension or a stub to redistribute attachment heights
• Guy wire installation — adding down-guys or span-guys to counteract the dominant moment direction, effectively “pulling” forces back toward equilibrium
• Load transfer — moving attachments to an adjacent pole or relocating equipment to reduce the moment at a critical structure
• Joint use rearrangement — working with telecom attachers to shift or remove wire attachments that are contributing disproportionate loading

Because all three steps — collection, analysis, and mitigation — live within Power-View, teams can manage the full lifecycle of a pole loading project in one platform. Field crews, engineers, and project managers share the same data model, reducing rework and accelerating the path from identified risk to completed construction.

Why This Matters for Grid Reliability and Safety

Overloaded poles are not just a compliance concern — they represent a genuine safety and reliability risk. A pole failure can mean downed energized conductors, service outages affecting thousands of customers, and serious public safety hazards.

The traditional approach to pole loading — spreadsheet-based calculations, disconnected survey tools, and paper-driven workflows — introduces significant lag time and error risk at each handoff. By consolidating the entire process inside a GIS-native platform like Power-View, utilities and engineering teams can:

• Identify overloaded poles proactively, before a storm or failure event
• Prioritize capital investment based on actual loading data, not assumptions
• Accelerate permitting and joint-use negotiations with documented analysis
• Maintain a living, auditable record of pole conditions and remediation history

The Bottom Line

Pole loading analysis has always been foundational to safe utility infrastructure — but historically it’s been slow, siloed, and paper-heavy. With Power-View, GridIntel is changing that equation. By integrating data collection, structural analysis, and construction project management into a single GIS platform, utilities can move faster, make better decisions, and keep the grid standing no matter what the weather throws at it.