EXCAVATOR LIFTING — TECHNICAL REFERENCE
Rated Capacity Indicators (RCI) for Excavator Lifting Operations
A quick reference on what UK legislation actually requires, the three tiers of device — overload warning, RCI and RCL — and what to specify for lifts over 1 tonne.
By Ricky Marsh, CPCS A61 Appointed Person · Issued June 2026
The bottom line
The law requires only an overload warning device. UK construction best practice requires a Rated Capacity Indicator (RCI) giving live load, radius and height. Proximity and exclusion-zone lifts require a Rated Capacity Limiter (RCL) with height and slew limiting.
Trigger threshold: object-handling capacity over 1,000 kg, or an overturning (load) moment over 40,000 Nm.
What the legislation actually requires
There is no UK regulation that names the “RCI” as a mandatory device. The requirement is built up from several instruments that bite once an excavator is used for lifting (object handling) rather than excavating:
LOLER 1998
The machine is now lifting equipment. Reg 4 (adequate strength and stability for each load), Reg 7 (marking of safe working load), Reg 8 (every lifting operation planned by a competent person, supervised and carried out safely), and Reg 9 (thorough examination — 12-monthly for the machine, 6-monthly for accessories).
PUWER 1998
Suitability, maintenance, and the requirement for protective devices and warnings (Regs 4, 5 and 24).
Supply of Machinery (Safety) Regs 2008
Forces the hardware onto new machines via the harmonised standards BS EN 474-1 / BS EN 474-5 and ISO 8643.
Where object-handling capacity exceeds 1,000 kg or the load moment exceeds 40,000 Nm, BS EN 474-5 / ISO 8643 require: (a) an acoustic or visual overload warning device; (b) a boom/dipper load-holding (check / hose-burst) valve; and (c) a rated lifting capacity (load) chart. Note that (a) is only a warning — it need not display numbers, know the radius, or stop the machine.
The three tiers of device
| Tier / device | What it does | Status & examples |
|---|---|---|
| 1. Overload warning device | Audible or visual alarm when the rated capacity or load moment is reached. No live readout, and it does not stop the machine. | Legal minimum under BS EN 474-5 / ISO 8643. Rarely fitted alone on a genuine lifting machine. |
| 2. Rated Capacity Indicator (RCI) | Live in-cab display of load on hook, radius, height and percentage of rated capacity against the programmed load chart; green to amber to red, with alarms around 90%. Indicates and warns — it does not cut motion. | UK construction best-practice expectation — what a lift plan usually means by 'an RCI'. For example Xwatch RCI Lite / XW1, GKD, JFP, SMIE or Prolec. |
| 3. Rated Capacity Limiter (RCL) + zone limiting | Everything the RCI does, plus it physically cuts or limits the machine motions to prevent the unsafe condition, with height, slew and zone / exclusion limiting. | Specified for proximity work (rail, highways, structures, overhead lines, confined slew). For example Xwatch XW2 (height) or XW5 (height + slew), and GKD equivalents. |
What to require
- ▪Standard lift over 1 t: a calibrated RCI (Tier 2) showing live load, radius and height, plus check valves and a matching load chart.
- ▪Proximity / exclusion-zone lift: an RCL (Tier 3) with height and slew limiting set to the zone.
- ▪Dedicated lifting point: a lifting eye (not bucket teeth), a load-rated quick hitch or pinned bucket, and the attachment weight included in the rated capacity.
Worked example
A 13 t 360° excavator slinging a 1.5 t drainage chamber is above 1 t, so EN 474 means it must at least have the overload warning device and check valves. To sign it off, the contractor will want a calibrated RCI showing the 1.5 t load against the chart at that radius. If the same lift is alongside a live railway or under overhead lines, specify an RCL (for example an Xwatch XW5) with slew and height limiting set to the exclusion zone.
Review stopper
For any lift above 1 t, the absence of a functioning RCI or of hose-burst / check-valve protection should be treated as a review stopper. Older, imported or retrofitted machines may lack either — verify before sign-off.
Key references
- ▪LOLER 1998; PUWER 1998; Supply of Machinery (Safety) Regulations 2008.
- ▪BS EN 474-1 & BS EN 474-5 (hydraulic excavators); ISO 8643 (boom-lowering control); BS 7121 (safe use of cranes) — planning benchmark.
- ▪SFPSG / CPA — Lifting Operations with 180° and 360° Excavators.
- ▪HSE — LOLER Approved Code of Practice and guidance.
Excavator RCI FAQs
Does an excavator need an RCI to lift?
Strictly, UK law (via BS EN 474-5 / ISO 8643) requires only an overload warning device once object-handling capacity exceeds 1,000 kg or the load moment exceeds 40,000 Nm, together with boom and dipper check valves and a load chart. In practice, UK construction best practice — and most contractors signing off a lift plan — expects a calibrated Rated Capacity Indicator (RCI) showing live load, radius and height.
What is the difference between an RCI and an RCL?
An RCI (Rated Capacity Indicator) indicates and warns — it shows the load, radius, height and percentage of capacity and sounds an alarm, but it does not stop the machine. An RCL (Rated Capacity Limiter) does everything an RCI does and then physically cuts or limits the machine motions, with height, slew and zone limiting. RCLs are specified for proximity work near railways, highways, structures or overhead lines.
At what point does an excavator become lifting equipment?
As soon as an excavator is used to lift and move a suspended load — rather than excavate — it is lifting equipment under LOLER 1998, and the lifting operation must be planned by a competent person. The device requirements under BS EN 474-5 apply once object-handling capacity exceeds 1,000 kg or the load moment exceeds 40,000 Nm.
Is an overload warning device the same as an RCI?
No. An overload warning device is only a buzzer or light that triggers at the safe maximum — no numbers, no radius, and it does not stop the machine. It is the legal minimum, not an RCI. An RCI is a live in-cab gauge of load, radius and height against the machine load chart.
Download this reference
Keep the RCI reference note on file or share it with your lifting team. Free to download and use — a competent Appointed Person should still review every lift plan.
Guidance note for RMT lift plan reviews — not a substitute for the full regulations or a competent person's assessment. Always confirm the devices fitted match the specific machine and the task in the lift plan.
Related excavator lifting resources
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From a CPCS A61 Appointed Person with 35 years of experience. LOLER compliant, Tier 1 contractor approved, fast turnaround.