Every overhead life line system needs something strong above the work area to hang from. Indoors, the cable is usually fixed to the building structure. Outdoors, where there is no building to fix to, TsaF designs a dedicated support structure. Where neither is practical, a freestanding mobile anchor such as TruckSafe or ConcreteSafe may be the better solution. The right choice depends on the site, the vehicles or equipment, and the structure available, so it is decided after a survey.
Written by: Yatin Chaudhary, TsaF. Last updated: 24 October 2026.
Key takeaways
- The support carries the fall load, so it is part of the engineered system.
- Indoor lines are usually fixed to the existing building structure, after an engineering check.
- Outdoor lines in open loading areas use a dedicated support structure.
- Freestanding mobile anchors suit areas with no structure, or work that moves.
- Every option needs a clearance check and a rescue plan.
Why the support decides the design
An overhead life line system is a tensioned stainless steel cable above the work zone. The worker connects through a trolley and a self-retracting lifeline, so the anchor point follows them along the vehicle or equipment. In a fall, the load passes through the cable and end terminations into whatever the line is fixed to. That support therefore has to be confirmed before anything else is designed: its position sets the line height, the spans and the clearance available below the worker.
Option 1: indoor, fixed to the building
Inside sheds, loading halls and production buildings, the line is typically fixed to the building structure above loading bays, machinery or production lines. This keeps the installation light, because the cable needs far less structure than a fabricated steel gantry.
Points to settle for an indoor line:
- whether the roof or frame members at the planned positions can take the loads, which is confirmed by an engineering check;
- clashes with cranes, lighting, ducts, sprinklers and other services along the route;
- the height of the vehicles or equipment below, and the clearance between them and the line;
- how many people will use the line at the same time.
Option 2: outdoor, on a dedicated support structure
Open tanker gantries, truck loading yards and wagon loading areas often have no building overhead. In these cases TsaF designs a dedicated support structure that carries the cable above the work zone. The structure is laid out around the vehicle positions and movements, so it protects the work area without obstructing traffic.
Outdoor lines are exposed to weather and, in some plants, to process environments. TsaF uses SS-316 cable and brackets for corrosion resistance. Any hazardous-area requirements are site-specific and must be confirmed with engineering for that location; they should never be assumed.
Option 3: a freestanding mobile anchor
Where there is no structure to support a line and building one is not practical, a freestanding mobile anchor may be a better fit. The TsaF Anchorline & Rescue range includes the TruckSafe and ConcreteSafe mobile anchors, which have a swing arm that rotates through 360°. A mobile anchor gives a single overhead anchor point rather than a continuous line, so whether it suits depends on how far the worker needs to move.
Comparing the three options
| Option | Usually suits | Key planning points |
|---|---|---|
| Fixed to the building | Indoor loading bays, work over machinery and production lines | Structural check of members; clashes with cranes and services; vehicle heights |
| Dedicated support structure | Open loading yards, tanker gantries and wagon loading | Layout around vehicle paths; foundations; weather and process environment |
| Freestanding mobile anchor | Areas with no structure, or work locations that change | Range of movement needed; placement; whether a single anchor point is enough |
Components common to fixed lines
Indoor and outdoor lines share the same core components, which are also used in the horizontal lifeline:
- an SS-316 cable tensioned by the TSAF-100A integrated shock absorber cum tensioner;
- TSAF-401 intermediate brackets on long lines, typically every 5 to 15 metres;
- a pass-through trolley for lines with intermediate brackets, or a non-pass-through trolley for single spans, each rated 15 kN;
- a TSAF-404 10 m retractable fall arrestor linking the trolley to the worker’s harness.
These values are indicative; project-specific values come from the datasheet and the design.
Clearance and rescue apply to every option
An overhead anchor reduces slack, but it does not remove the need to check fall clearance and swing fall for each work position. After a fall is arrested, the worker must be lowered or rescued promptly, so each line should be planned together with a rescue method, trained rescuers and equipment on site. Our guide to rescue planning explains what to prepare.
What to send TsaF
| Information | Why it matters |
|---|---|
| Indoor or outdoor, with photos of the area | Decides the support option |
| Drawings of the building or yard | Shows where a line could be fixed or a structure placed |
| Vehicle or equipment types and heights | Sets the line height and clearance |
| Length of the work zone and number of bays | Sets spans and trolley type |
| Number of simultaneous users | The line is designed for a set number of users |
| Environment and any hazardous-area classification | Affects materials and equipment selection |
For truck and tanker bays specifically, see overhead lifelines for loading bays and vehicle tops and our overhead life line system checklist.
Frequently asked questions
No. Indoors it is usually fixed to the building structure. Outdoors, TsaF can design a dedicated support structure, and where neither is practical a freestanding mobile anchor may suit better.
Yes, if the line is designed for it. Pass-through trolleys move past intermediate brackets, so a single line can cover several bays.
Outdoor lines are exposed, which is why TsaF uses SS-316 cable and brackets. The annual inspection checks the cable, brackets and trolleys for wear and corrosion.
Sometimes. A mobile anchor gives a single anchor point, so it suits work in one area. Where people move along a long vehicle or several bays, a continuous line is usually more practical.
Users should check the trolley and arrestor before each use, and TsaF recommends a formal inspection at least once a year.
TsaF surveys the area, engineers the support and the line, manufactures components in Jewar and installs each overhead life line system. Request a site assessment for your loading or work area.
