Non-LED Bird
Diverter for
Power Lines
A fully passive, maintenance-free bird flight diverter. Glow-in-dark photoluminescent flapper, multicolour retroreflective stickers and 360° rotation — no battery, no charging, no servicing. Ever.
Zero Maintenance
Glow-in-Dark
No Battery
CEA Compliant
——-Why Diverters Matter
Bird Collisions with
Power Lines — The Scale
India’s growing transmission and distribution network crosses millions of hectares of ecologically important land. Without proper marking, overhead conductors are functionally invisible to birds in flight — with fatal consequences for individuals and populations alike.
Why Birds Cannot See Power Lines
Birds lack the binocular frontal vision that allows humans to judge depth and distance precisely. At speed, thin conductors — especially ground wires and shield wires — register as indistinguishable from sky background. Birds that do detect the wire often have insufficient reaction time to change flight path, particularly large-bodied species such as bustards, cranes, storks and raptors that require longer distances to manoeuvre.
70%+
of wire strike victims are large or endangered species
Why Passive Diverters Are the Standard Solution
The passive non-LED bird diverter is the most widely deployed bird collision mitigation device globally and in India. Its advantages are straightforward: it requires no power, no maintenance and no skilled servicing after installation. It operates continuously through wind, sun, rain and darkness without human intervention. For large-scale deployments across hundreds of kilometres of rural and semi-urban distribution lines, this zero-operational-cost profile makes the passive diverter the practical and economically sound choice.
60%+
proven collision reduction with correct installation spacing
——Product Design
Five Features That Make
the PLM/NLD-V1 Workduct Design
01
No Battery or Power Source Required
The PLM/NLD-V1 is a fully passive device. It draws zero electrical power, requires no solar panel and has no battery to charge, replace or monitor. The entire visual warning system operates through reflected and stored light, and wind-driven mechanical motion. This makes it the only bird diverter that can be specified with absolute confidence in zero ongoing operational cost — from installation day to end of service life.
Operational cost: zero
02
Glow-in-Dark Photoluminescent Flapper
The circular 180mm flapper is manufactured from photoluminescent polymer — the same material class used in emergency exit signage. During daylight hours the material absorbs UV and visible light. After sunset it emits a sustained green glow covering over 12,000 mm² per face, providing passive night-time visibility for several hours into the night. This covers the early-night flight window of many crepuscular and nocturnal bird species without any active power draw.
12,000 mm² glow area per face
03
Multicolour Retroreflective Stickers
High-visibility retroreflective panels in alternating red, yellow and white cover over 5,500 mm² per face. Unlike glow-in-dark material, retroreflective panels do not require pre-charging — they reflect any available light source back toward its origin at high efficiency. Under headlamp light, aircraft navigation lighting or any other directional source, the marker appears brilliantly lit. These panels degrade very slowly under UV exposure and maintain reflective performance throughout the device’s service life.
5,500 mm² retro area per face
04
360° Seamless Swivel Rotation
A frictionless 360° swivel allows the flapper to rotate continuously in any wind direction. Combined with a pendulum swing mechanism, the device is in near-constant motion in the open-terrain environments where power lines typically run. This continuous motion serves a critical function — a moving object in the field of view is detected far earlier by bird visual processing systems than a stationary marker of identical size and colour. The pendulum restricts swing amplitude in high winds to prevent jerky, erratic movements that could reduce rather than enhance alertness.
Wind-driven · pendulum stabilised
Wind-driven · pendulum stabilised
05
Lightweight Universal Clamp Design
At under 350 grams, the PLM/NLD-V1 is the lightest model in the range. The universal clamp fits conductors from 5mm to 38mm without adapter rings or sizing variants, covering the full range of LT, HT and transmission conductors used across India’s power network. The low weight is significant for large-scale deployments — CEA installation spacing of every 10 metres means a single kilometre of line requires approximately 100 units. The lightweight design ensures no measurable impact on conductor sag or tension at any standard installation density.
Fits 5mm–38mm · <350g
Operating Principle
How a Passive Diverter
Protects Birds
Three complementary mechanisms work simultaneously — visual contrast, motion, and bird avoidance response — to make power line conductors detectable at a safe distance without any energy input.
01
Visual Contrast & Visibility1
The primary function of any bird diverter is to make the wire detectable at sufficient approach distance for the bird to react. The PLM/NLD-V1 achieves this through three passive visual cues: multicolour retroreflective stickers that create high contrast against sky and landscape backgrounds in daylight; a photoluminescent glow in the hours after sunset; and the physical size of the 180mm circular disc, which dramatically increases the apparent cross-section of an otherwise invisible 10mm conductor. Together these ensure the marker is visible from hundreds of metres in good conditions and at meaningful distances in low-light conditions.
PASSIVE · ALL-WEATHER
02
Wind-Driven Motion Warning
A stationary marker of any size is far less effective than a moving one. Bird visual systems evolved to detect motion — it is one of the fundamental cues for identifying both predators and prey. The PLM/NLD-V1’s 360° swivel and pendulum swing mechanism convert wind energy into continuous rotational and oscillatory movement, creating a dynamic visual target that draws attention far more reliably than a static disc. The spinning flapper also produces a brief flash effect as retroreflective panels rotate through the sun angle, generating intermittent high-contrast signals at range.
WIND-ACTIVATED · DYNAMIC
03
Bird Avoidance Response
When a bird detects the marker at sufficient distance, its natural collision avoidance behaviour takes over. Studies across multiple raptor, crane and waterbird species show consistent avoidance of marked power line spans, with collision reduction rates of 60% or greater at recommended installation spacing. The marker does not need to frighten or repel birds — it simply needs to be detected early enough that normal flight adjustments can be made. The combined visual and motion cues of the PLM/NLD-V1 reliably trigger this early detection response across the range of bird body sizes and approach speeds encountered on Indian power lines.
PROVEN · 60%+ REDUCTION
—-Technical Data
PLM/NLD-V1
Specifications
| Compliance Standard | CEA Technical Specification for Bird Flight Diverters Central Electricity Authority, Government of India |
| Power Requirement | None — fully passive No battery, no solar panel, no grid connection |
| Working Temperature | −20°C to 100°CFull operation across Indian climate range |
| Conductor Clamp Size | Universal — 5mm to 38mmFits ACSR, AAC, AAAC and all standard Indian conductors |
| Flapper Diameter | 180 mm |
| Glow Area per Face | +12,000 mm²Photoluminescent — passive post-sunset visibility |
| Retroreflective Area per Face | +5,500 mm²Multicolour high-visibility panels |
| Weight | Less than 350 grams |
| Height from Clamp | 330 mm |
| Swing Mechanism | Pendulum — stable in high-speed wind |
| Material | UV-stabilised weatherproof polymer |
| Compatible Line Voltages | LT, 11kV, 33kV, 66kV, 132kV, 220kV, 400kV |
| Installation Method | Hot-stick installation — no line shutdown required |
| Rotation Mechanism | 360° seamless swivel |
What Makes These Specs Practical
Zero power
the only bird diverter with no operational running cost after installation. Total cost of ownership over 10 years equals the purchase price alone
12,000 mm² glow area: power
the largest passive glow surface in this product category. More glow area means a wider angle of night visibility — important for birds approaching from oblique angles.
−20°C to 100°C:
tested for Himalayan high-altitude winter lines and Rajasthan summer transmission routes in the same product — no seasonal variants needed.
<350g weight
at CEA-recommended 10m spacing, each kilometre of line carries ~100 units — 35kg total additional conductor loading, well within standard conductor tension tolerances
Hot-stick installation:
eliminates power shutdown costs. For rural distribution lines serving agricultural feeders, a shutdown may affect thousands of consumers and entail significant cost — hot-stick capability directly reduces total project installation cost.
CEA COMPLIANT
MADE IN INDIA
TEST CERT
UV STABLE
Use Cases
Where Non-LED Diverters
Are the Right Specification
The passive non-LED bird diverter is the correct specification wherever daytime visibility, cost efficiency and maintenance-free deployment are the primary requirements. These represent the majority of Indian power line installations.
APPLICATION 01
Rural Distribution Lines
India has hundreds of thousands of kilometres of rural LT and 11kV distribution lines crossing agricultural land, grassland and village commons. These lines represent the single largest bird diverter deployment opportunity — and the passive non-LED model’s zero maintenance profile is perfectly matched to rural deployments where return maintenance visits are logistically difficult and expensive.
Recommended: PLM/NLD-V1 for LT/11kV rural bulk deployments. Lower unit cost, zero operational cost, hot-stick installation.
APPLICATION 02
Wildlife Sanctuaries & Buffer Zones
Lines crossing or bordering wildlife sanctuaries, national parks, tiger reserves and their buffer zones face the strictest environmental compliance requirements. The passive diverter’s lack of electronic components, batteries or chemical materials means there is no risk of environmental contamination if a unit is damaged or dismantled — an important consideration in protected area environmental management.
Preferred for protected area specifications: no batteries, no chemicals, no maintenance access required inside sanctuary boundaries.
APPLICATION 03
Transmission Line Spans (Daytime Risk)
HV and EHV transmission lines crossing open terrain where bird activity is primarily diurnal — large raptors, soaring eagles, dry-land crane species — are well served by passive diverters. The large retroreflective area and 180mm disc diameter provide excellent daytime visibility on long spans. Where nocturnal or dawn/dusk risk is low and LED active marking is not required by the environmental clearance, the passive model delivers CEA compliance at substantially lower cost per kilometre.
Specify: PLM/NLD-V1 on transmission spans with daytime-only bird activity; PLM/LD-V1 on crossing spans with documented nocturnal use.
APPLICATION 04
Wetland & River Crossing Spans
Lines crossing rivers, reservoirs, canals and wetlands are among the highest-risk spans on any distribution network. Waterbirds — ducks, geese, cormorants, pelicans, herons, kingfishers — cross these spans repeatedly during daily feeding cycles. Passive diverters installed at 5m spacing on crossing spans provide highly effective daytime protection for these concentrated movement zones at an affordable cost.
Closer spacing (5m) recommended for river and lake crossing spans to match higher bird traffic density.
Why Choose Passive
The Three Practical
Advantages
The passive non-LED bird diverter’s commercial case rests on three clearly quantifiable advantages over active LED alternatives for most deployment scenarios.
Lowest Total Cost
The non-LED model carries a lower unit purchase price than the LED variant, and zero ongoing operational cost. Over a 10-year deployment on a 100km rural distribution line requiring approximately 10,000 units, the cost differential versus LED diverters — purchase price plus maintenance visits avoided — is substantial. For state DISCOM procurement under budget constraints, this makes the passive model the economically rational choice for all spans that do not specifically require active LED marking.
Unit cost + 10-year ops cost = purchase price only
Zero Maintenance
There is nothing to service. No battery to replace when it degrades after 3–5 years. No solar panel to clean when dust accumulates. No electronic circuit to fail or short in monsoon water ingress. No firmware to update. No specialist technician required. The passive diverter’s mechanism — a polymer disc on a stainless steel swivel — has no consumable components. Once installed correctly, it requires no further attention for its entire service life. For utilities managing thousands of kilometres of line, this operational simplicity translates directly into lower total cost of asset management.
No battery · No panel · No circuit · No visits
10+ Year Service Life
UV-stabilised polymer construction and stainless steel hardware resist the full range of Indian climate stressors — UV radiation, monsoon humidity, dust, freeze-thaw cycling at altitude, salt air on coastal lines. The expected field service life exceeds 10 years under normal operating conditions. This compares favourably with active LED diverters, where battery service life of 3–5 years typically triggers the first maintenance cycle and its associated cost. The passive diverter’s extended service life significantly improves whole-life cost per unit of bird protection delivered.
10+ year field life · UV stable · Weatherproof
When to Upgrade to LED
The passive non-LED diverter is the right specification for the majority of Indian power line spans. Upgrade to the LED Blinking Marker (PLM/LD-V1) specifically for spans where bird activity is documented at night or during fog — including nocturnal migration corridor crossings, airport-vicinity lines, fog-prone river plains and spans serving habitats with documented nighttime bird use. Many projects use a mixed specification: passive diverters on the majority of spans, LED on critical crossings.
Common Questions
Non-LED Bird Diverter
FAQ
Installation, Lifespan & Compliance
These questions address the most common procurement and technical concerns from utility engineers, DISCOM procurement officers and project contractors. Need a specific answer? Contact our technical team.
Ask a technical question →
The PLM/NLD-V1 is manufactured from UV-stabilised weatherproof polymer with stainless steel hardware. Under normal Indian field conditions — including summer UV exposure, monsoon humidity and winter temperature cycling — the product is designed for a minimum service life of 10 years. Because there are no electronic components, batteries or moving parts that wear out in a conventional mechanical sense, units often remain functional well beyond this. The sealed swivel bearing is the only mechanical element and is selected for long-term low-friction operation without lubrication
No. The PLM/NLD-V1 is designed for hot-stick installation on energised conductors without a power shutdown. The universal clamp mechanism allows the unit to be placed and secured on the conductor using a standard insulated hot stick. This is particularly important for rural agricultural feeder lines and urban distribution circuits where a shutdown would cause significant consumer disruption and carry associated regulatory and commercial costs. Installation on de-energised lines is also straightforward if preferred or required by site-specific safety procedures.
Yes. The PLM/NLD-V1 is designed and tested in compliance with the Central Electricity Authority (CEA) technical specifications for bird flight diverters issued by the Government of India. We supply full test certificates, compliance documentation and product datasheets with all bulk orders. This documentation is suitable for inclusion in DISCOM tender submissions, PGCIL project compliance files, Forest Department approval applications and environmental clearance documentation for infrastructure projects.
CEA guidelines specify spacing of approximately every 10 metres on line spans within ecologically sensitive zones including wildlife sanctuaries, Important Bird Areas (IBAs), wetland buffers and national park periphery areas. For the highest-risk locations — river and lake crossings, confirmed breeding colony adjacencies and active flyway corridors — tighter spacing of 5 metres is recommended. Diverters should be installed on all conductors in the span, typically staggered in height between phase conductors. We provide detailed installation layout guidance documentation with all bulk orders.
The photoluminescent flapper absorbs UV and visible light during daylight hours and begins emitting a green glow immediately after sunset. Glow intensity is highest in the first hour after dark and diminishes over approximately 4–6 hours depending on the level of prior daylight exposure. The total glow area per face of 12,000 mm² is significantly larger than most competing products, providing wide-angle passive visibility during the early-night flight window. For spans requiring visibility throughout the full night, or where fog and low ambient light reduce passive glow effectiveness, the LED Blinking Marker (PLM/LD-V1) is the appropriate specification.
Ready to Deploy
the Non-LED
Diverter?
Bulk supply available for state DISCOMs, EPC contractors, transmission utilities, forest departments and renewable energy developers. Full CEA compliance documentation included.
CEA test certificates provided with every order
✓Hot-stick installation — no power shutdown needed
✓Bulk pricing from 500 units, fast dispatch from New Delhi
✓Technical support for project specification and layout
✓Government GST invoicing and tender documentation available
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Also Available
Complete Diverter Range
The PLM/NLD-V1 is part of a three-product CEA-certified range. LED and Aero Spin variants are available for spans requiring active night visibility or wind-corridor kinetic performance.
ACTIVE · SOLAR POWERED
LED Blinking Bird Diverter
PLM / LD-V1
6 high-intensity blinking LEDs per face, solar charged, 100+ hour battery, auto day/night switching. For night migration routes, fog zones, airports and critical EHV spans.
View Product →
ACTIVE · SOLAR WIND ACTIVATED · HIGH-WIND CORRIDORS
Aero Spin Diverter
PLM / AER-V1
Multi-blade aerodynamic spinner activates in light breeze. Larger visual footprint than disc-type. For desert transmission routes, coastal lines, open ridgeline spans and GIB habitat corridors.
View Product →