FAQ

Are reconditioned or used stringing machines a safe option?+

Reconditioned units are cost-effective when refurbished, load-tested and warranted. For critical HV work new machines are recommended.

Reconditioned machines can be cost-effective if professionally refurbished, load-tested, and supplied with test reports and limited warranties. For mission-critical high-voltage work, new machines provide longer service life and manufacturer warranty. We sell both new and certified reconditioned units with documentation.

What is the difference between bullwheel pullers and capstan winches?+

Bullwheels handle heavy continuous pulls and large conductors; capstans are for lighter or flexible pulls. Choose by conductor size and pull distance.

Bullwheel pullers provide controlled pulling via large friction wheels (good for heavy conductors and long pulls), while capstan winches offer flexible line-handling for lighter duties. Bullwheels handle higher continuous loads; choose based on conductor size, pull length and rope type (synthetic vs wire).

How should I store and transport sheaves and blocks to avoid damage?+

Store sheaves dry and protected; crate to prevent impact and secure during transport. Log serials and inspection dates to extend service life.

Store sheaves clean, dry and protected from impact; wrap or crate to avoid nicks. During transport secure against shock and vibration; pack grooves so they don’t rub on other hardware. Keep a log of serials and manufacturer inspection dates. Proper storage extends life and prevents failure in the field.

What are typical lead times for stringing equipment shipped from China in 2025?+

Question Answer Meta Can drones carry pilot lines for transmission stringing? Yes. Drones are increasingly used to carry lightweight pilot ropes and pull-in lines across difficult terrain, speeding initial line deployment and reducing helicopter costs. Drones are typically used only for pilot-line deployment — the heavy conductor pulls are then completed with standard tensioners and pullers. Alwa

Lead times depend on model availability and stock levels — typical ranges are 2–12+ weeks for manufacturing plus transit time. Sea freight is economical for heavy units, air for urgent parts. Confirm current lead times in your RFQ as logistics and component availability remain variable.

What spare parts should every job carry for tensioning?+

Carry spare sheaves, bearings, pins, hoses, seals, filters and spare ropes. We offer pre-packed spare kits for rapid global delivery.

Essential spares include spare sheaves, bearings, keeper pins, hydraulic filters, hoses, seals, spare ropes/straps, and a dynamometer calibration check kit. Customize the kit per the machine model and local shipping lead times. We offer pre-packed rapid-response spare kits for global shipping.

How often should I schedule preventive maintenance for tensioners and pullers?+

Inspect daily, lubricate monthly, do hydraulic/system checks quarterly and full annual inspection with load tests. Keep spare parts to reduce downtime.

Follow manufacturer recommendations — inspect daily before use, perform monthly lubrication and quarterly hydraulic/system checks, and annual comprehensive inspection including load testing. Keep maintenance logs and stock critical spares (seals, bearings, hydraulic filters) to prevent downtime. Maintenance intervals vary with usage intensity.

Can your equipment be used for live-line (energized) stringing?+

Live-line stringing needs insulated tools and certified crews—heavy pulls are usually done de-energized. Ask about hot-stick-compatible accessories.

Live-line work requires specialized insulated tools and certified live-line crews. Most heavy tensioning is done de-energized and grounded. If live-line methods are required, request our insulated tool options and hot-stick-compatible accessories and ensure compliance with local live-line regulations and training requirements.

What documentation and test reports come with new machines?+

New machines come with factory load-test reports, CE/ISO paperwork and operation manuals. Third-party FATs and dynamometer certificates available on request.

Machines are factory load-tested and come with test reports, CE/ISO documentation where applicable, and operation manuals. We also support third-party FAT inspections and provide calibration/certificates for dynamometers on request. Provide purchase order details and we’ll include the required certification package.

Rent or buy tensioners — which is better for my company?+

Rent for intermittent use, buy when utilization justifies capex. Evaluate financing, maintenance capacity, spares and total cost of ownership.

Rent if you have intermittent projects or need to trial equipment; buy if utilization is high enough to justify capex, and you have maintenance capability. Consider financing, downtime risk, spares access, and total cost of ownership. We offer purchase, leasing and short/long-term rental options to match project needs.

How do I estimate safe pulling tension for long HV cable pulls?+

Calculate pulling tension from cable weight, duct friction, bends and lubricant. Use vendor pulling tables and stage reels for very long or curved pulls.

Calculate using cable weight, duct friction coefficient, number of bends, lubricant performance, and length. Use manufacturer pulling tables or calculators; for long/heavily-bent runs stage reels or intermediate winches to limit peak tension. When in doubt, consult cable maker for max allowable tension to avoid jacket or conductor damage.

What are best practices for matching sheave size to conductor?+

Use sheaves sized to meet conductor bending radius recommendations. Larger sheaves and multi-roller fairleads prevent strand damage—follow conductor guidelines.

Use sheave diameters that meet or exceed recommended minimum bending radii for the conductor to prevent strand damage. For compact/HTLS conductors, larger sheaves and multi-roller fairleads reduce localized pressure. Check conductor manufacturer installation guidelines and ensure sheave grooves are clean, properly lubricated and free of burrs.

Are remote-control and automation options available for pullers/tensioners?+

Remote and automated tensioners (wireless controls, dynamometers, CTCS) improve safety and precision—field training required for safe operation.

Yes. Remote wireless control reduces exposure to hazards and improves precision. Options include wireless joysticks, integrated dynamometers, PLC control and automated tension setpoints (CTCS). Remote features speed setups and allow single-operator control for many actions; field training is required to use them safely and effectively.

Can your tensioners handle HTLS and compact conductors?+

We supply tensioners rated for HTLS/ACCC/compact conductors with correct sheave sizes and tension control settings—send conductor datasheets for matching.

Yes — we offer tensioners and sheaves rated for HTLS, ACCC, and compact conductors. HTLS types require careful matching for higher operating temperatures and different strand geometry; we recommend specific sheave diameters, roller profiles and tension control settings to avoid strand damage and ensure correct sag. Provide conductor datasheets for tailored recommendations.

Do you provide operator training and on-site commissioning?+

We provide on-site commissioning, operator training and maintenance instruction, plus FAT documentation to ensure safe, efficient equipment use.

Yes. We provide on-site commissioning, operator training, and maintenance instruction packages worldwide. Training covers safe setup, tension control, remote operation, routine inspections, and troubleshooting. Commissioning includes factory acceptance tests (FAT) documentation and site acceptance to verify equipment performance under job conditions.

What inspections should I perform on stringing blocks before use?+

Inspect blocks for cracked/worn sheaves, bearing play, frame deformation, pins, and lubrication. Replace worn parts and document with pre-job checklists.

Inspect sheave surfaces for cracks/wear, check bearings and swivel action, inspect frames for deformation, verify keeper pins and ball-pin locks, confirm sheave diameters meet conductor requirements, and ensure lubrication. Replace worn or cracked sheaves, and document inspections in a pre-job checklist to meet safety and warranty requirements.

What temporary grounding procedures are required during stringing?+

Use temporary grounding sets and trained crews to manage induced/residual voltages. Follow local utility rules and safety codes before stringing.

Temporary grounding protects crews from induced or residual voltages. Install grounding sets per local utility standards and regulations, ensuring proper clamp placement, cable sizing and multiple grounds where needed. Train crews on grounding sequences and confirm de-energized status before work near live parts. Always follow national/regional electrical safety codes and job-specific risk assessments.

Which cable pulling lubricants are best for XLPE and long duct pulls?+

Use slow-drying gel/wax lubricants (Polywater J/PJ/NN) for XLPE long pulls. Confirm compatibility and follow manufacturer pulling tables.

Use slow-drying gel or wax lubricants specifically designed for XLPE and long pulls (Polywater J, PJ, NN types are industry examples). Apply per cable and lubricant manufacturer guidance — pump/ pour methods for long ducts reduce friction and pulling tension. Confirm chemical compatibility with jacket and duct materials and follow vendor pulling tables for tension estimates.

What is constant tension control (CTCS) in stringing equipment?+

CTCS keeps steady conductor tension during stringing to prevent damage and improve sag accuracy—recommended for long spans and HTLS conductors.

Constant tension control maintains a set conductor tension throughout payout and pull-in to prevent slack or overload. CTCS systems avoid jerking or bouncing, protect conductor integrity (especially HTLS and compact conductor types), and improve sag accuracy. They are standard on modern tensioners and recommended for long spans, bundled conductors, or projects with tight sag tolerances.

How do I choose the right tensioner/puller capacity for my conductor?+

Choose tensioners by conductor type, diameter, span length and target tension. Provide conductor specs to get a model with correct kN rating and sheave size.

Match equipment capacity to conductor type (ACSR/OPGW/ADSS/HTLS), conductor diameter, required stringing tension, and max span load. Provide conductor specs (weight/dia), longest span, and temperature/sag targets. We’ll recommend a model based on required kN ratings, sheave size, and braking/payout control capability. Always include a safety margin above calculated tension.

Can drones carry pilot lines for transmission stringing?+

Drones can deploy pilot lines to speed stringing in tough terrain. Use certified pilots, plan for wind/battery limits, and complete heavy pulls with tensioners.

Yes. Drones are increasingly used to carry lightweight pilot ropes and pull-in lines across difficult terrain, speeding initial line deployment and reducing helicopter costs. Drones are typically used only for pilot-line deployment — the heavy conductor pulls are then completed with standard tensioners and pullers. Always verify regulatory compliance and plan for wind, battery life, and safety contingencies.

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