Installation and assembly of industrial hoses
NORRES BAGGERMAN issues three installation guides that together cover the practical side of hose delivery: general installation rules per DIN 20066, assembly of cable protection hoses, and assembly of technical hoses with grounding against electrostatic charging. Correct installation is what makes the difference between a hose that lasts for years and one that fails early.
Why correct installation extends service life
A hose chosen correctly for material, dimension and standard compliance can still fail early if it is installed incorrectly. Torsion on a spiral hose builds up material stress that over time leads to cracks on the outside. Too sharp a bending radius pinches the inside and can reduce flow capacity by 30–40%. A hose that touches a floor surface will wear faster from friction than from the medium running through it. NORRES BAGGERMAN's installation guides collect the mechanical fundamentals — the ones you should know regardless of which hose you are working with.
Installation per DIN 20066
NORRES BAGGERMAN's installation guidelines are based on DIN 20066 (hose assemblies — technical delivery conditions) and the German BG guideline Merkblatt T 002. The core rules that apply to virtually all industrial hoses are:
- Install the hose free of torsion — no twisting along the axis.
- If the hose has a flow arrow, install it in the direction of flow.
- Use a roll or hose saddle at 180-degree turns with a diameter corresponding to the allowed bending radius.
- Establish the curve as a 180-degree arc with sufficient straight ends — measure the installation distance based on the required bending radius.
- Avoid irregular distortion directly behind connection armatures. Respect the minimum bending radius.
- The hose axis and motion plane must be in the same surface plane to prevent damaging torsional stress.
- Hoses must not touch the floor, walls or other objects — this creates wear and heat build-up.
- If external mechanical wear cannot be avoided (e.g. the hose is often pulled across the floor): use highly abrasion-resistant PUR or CP hoses with outside steel clamp profiles.
Cable protection hose assembly (CM)
NORRES BAGGERMAN's Montageanleitung CM covers cable protection hoses in types 101–109 (NORDUC® family). The hoses are used as installation conduits for electrical cables, data connections and pneumatic lines that need mechanical protection.
There are three cutting methods for cable protection hoses: pure bending of the spiral, cutting the material with a knife, or sawing — the method depends on hose type and dimension. NORDUC® is built with an integrated single-hand assembly system that frees one hand during installation to guide the cables. Correct selection of coupling type and o-ring delivers IP-65 or IP-68 sealing (per EN 60529 — see the Technical data section).
Technical hose assembly (IH) and grounding
Montageanleitung IH covers technical hoses in types from the AIRDUC and NORPLAST family. The most important theme here is the grounding on AS hoses (antistatic) and PUR-C/PVC-C AS types.
Safety rules when knife-cutting spiral-reinforced plastic hoses:
- Use cut-resistant gloves.
- Hold arms parallel and move the knife strokes away from the body.
- Keep at least 10 cm of safety distance between hands and knife edge.
- Cutting metal hoses 375–377 is done with an angle grinder, not a knife.
The actual grounding on an AIRDUC PUR-C AS or NORPLAST PUR-C AS hose is a step-by-step process where a copper wire is exposed at the end, bent to the outside, and fastened so it makes contact with grounded armatures. If this connection is not established correctly, the AS property does not work in practice. This is what we have written the article "The invisible weakest link" about — for most ATEX incidents on hose lines, it is the grounding connection that is the failure cause, not the hose material itself.
Grounding requirements against electrostatic charging
TRGS 727 sets the precise resistance limit: below 109 Ω surface resistance measured between two grounded hose ends. If the resistance is higher, the hose does not meet the requirement for antistatic use regardless of what the marking says. The measurement should be performed after the installation is complete — not just on a factory-fresh hose.
Local rules often go beyond the European minimum. In Denmark, for example, additional requirements apply from the Danish Working Environment Authority and from sector-specific regulations on hazardous areas. We help derive the concrete requirements for your installation.
Download installation and assembly guides
Frequently asked questions about installation and assembly
What is the minimum bending radius of a hose?
The minimum bending radius is specified on each hose type's datasheet and depends on material and diameter. As a rule it is between 5 and 10 times the hose's outer diameter. For specific values, refer to the factsheet or contact us.
What is DIN 20066?
DIN 20066 is the German standard for hose assemblies ('Hose assemblies — technical delivery conditions'). It specifies test methods, marking and technical requirements for hose assemblies, and is the standard NORRES BAGGERMAN's Verlegerichtlinien is based on.
Which installation errors are most common?
The most common errors are: torsion during assembly (twisting around the hose axis), too sharp a bending radius, the hose touching the floor or walls, and incorrect or missing grounding on AS/EC hoses. The last one is the most safety-critical.
How is a spiral-reinforced plastic hose cut correctly?
With cut-resistant gloves, parallel arms and at least 10 cm of safety distance between the knife edge and your hands. Move knife strokes away from the body. For metal hoses 375-377, use an angle grinder, not a knife.
What is the NORDUC system?
NORDUC® is NORRES BAGGERMAN's single-hand assembly system for cable protection hoses. It frees one hand during installation to guide the cables, making assembly faster and more ergonomic.
What IP class can the NORDUC system achieve?
With the correct coupling type and o-ring choice, IP-65 or IP-68 per EN 60529 is achieved.
Where do I find the full assembly guide?
The three installation guides are available as PDFs at the bottom of this page: Installation guidelines (DIN 20066), Cable protection hose assembly (CM) and Technical hose assembly (IH).