A
- A4-80 Fastener grade
- Property class designation for austenitic stainless steel fasteners (bolts, nuts, washers). "A4" denotes 316 stainless steel; "80" denotes a minimum tensile strength of 800 N/mm². The standard fastener grade specified for offshore and marine cable cleat installations. Never substitute A2 (304 grade) in C5-M environments. Defined in ISO 3506.
- Armour (cable) Cable construction
- A layer of steel wires or tapes helically wound around a cable to provide mechanical protection against impact, tension and rodent attack. Submarine export cables typically use double steel wire armour (DSWA). The armour layer increases cable outer diameter and contributes significantly to cable weight — both factors in hang-off load calculations at J-tube entry points.
B
- Bend stiffener Offshore accessory
- A tapered polyurethane or polymer sleeve fitted over a cable at the point where it enters a J-tube bell mouth or other structural opening. Its graduated stiffness transitions from the cable's natural bending stiffness to the rigid entry point, preventing the formation of a hard-bend stress concentration under dynamic loading from tidal currents and wave action. Not the same as a bend restrictor, which is a rigid device limiting the minimum bend radius by mechanical contact.
- Biofouling Offshore environment
- The accumulation of marine organisms — barnacles, mussels, algae, biofilm — on submerged or splash-zone surfaces. Biofouling on cable cleat bodies increases weight loading and can trap moisture and aggressive ions against metal surfaces, accelerating crevice corrosion. In submerged J-tube zones, biofouling must be considered in maintenance inspection planning; 316L stainless is generally resistant to the corrosion mechanism associated with biofouling but requires periodic physical removal of organisms.
C
- Cable cleat Core term
- A mechanical device designed to secure, support and restrain single or multiple electric power cables at intervals along their route. The primary function of a cable cleat — as distinct from a simple cable support — is to maintain cable position during a short-circuit fault event, when electromagnetic forces can generate impulse loads of thousands of newtons per metre. Defined and tested under IEC 61914. See also: What Is a Cable Cleat?
- Cable ladder Cable support system
- A structural cable support system consisting of two longitudinal side rails connected by transverse rungs, resembling a ladder. Cables lay on the rungs and are secured by cable cleats fixed to the rung. The ladder itself does not restrain cables under fault conditions — the cleats do. Cable ladders in wind turbine towers are typically manufactured from hot-dip galvanised steel or stainless steel and run vertically up the tower wall.
- Cable whip Fault mechanics
- The violent oscillatory motion of an unsecured or inadequately secured cable during a short-circuit fault. The oscillating electromagnetic force between conductors drives the cable to swing back and forth at twice the supply frequency, potentially displacing, abrading or severing the cable. Cable whip is the failure mode that cable cleats are specifically designed to prevent. See: What Is Short-Circuit Electromagnetic Force?
- Cathodic protection (CP) Offshore corrosion
- An electrochemical technique for preventing corrosion of steel structures in seawater by maintaining the structure at a protective electrochemical potential. Two forms are used on offshore wind foundations: sacrificial anode CP (passive, using zinc or aluminium anodes attached to the structure) and impressed current cathodic protection (ICCP, active, using a rectifier to drive current). Metallic cable cleat bodies in CP-protected zones must be considered in the CP design calculation. See also: ICCP.
- C5-M Corrosion category
- The highest standard atmospheric corrosion category defined in ISO 12944, designating marine environments with very high salinity and humidity — open sea, coastal zones, offshore structures. At C5-M, unprotected carbon steel degrades severely within months. Aluminium alloys without surface treatment are susceptible to pitting. The minimum cable cleat material grade for C5-M is 316L stainless steel body with A4-80 fasteners and EPDM liner. See: Offshore, Onshore, High-Temperature Environments.
D
- DIN 3015 Standard
- A German standard specifying pipe clamps for hydraulic and pneumatic systems. Comprises three parts: Part 1 (single-bolt light series, LS), Part 2 (twin-bolt heavy series, HS), and Part 3 (cushion insert elements). DIN 3015 clamps are the predominant pipe-fixing hardware in wind turbine hydraulic, cooling and pitch-control circuits. The standard defines geometry and dimensional tolerances; material grade is selected by the designer based on the installation environment. See: DIN 3015 Part 1, 2 and 3 Explained.
- DNV-GL ST-0126 Standard
- DNV GL Standard ST-0126, "Support structures for wind turbines." Covers the structural design of offshore wind turbine foundations including monopiles, jacket structures and transition pieces. Relevant to cable cleat selection in that it governs the structural interfaces to which cable cleat mounting brackets attach, and addresses J-tube cable entry design requirements including dynamic load cases and inspection access.
E
- EPDM Liner material
- Ethylene Propylene Diene Monomer rubber. The preferred elastomeric liner material for cable cleats in offshore, coastal and general industrial environments. Key properties: excellent resistance to ozone, UV and weathering; good performance in seawater immersion; working temperature range approximately −40 °C to +120 °C. Not compatible with petroleum-based hydraulic oils — use NBR where oil contact is possible. The standard Part 3 (DIN 3015) insert material for offshore hydraulic pipe clamps.
- Electromagnetic force (cable) Fault mechanics
- The force per unit length acting between two parallel current-carrying conductors, arising from the interaction of each conductor's current with the magnetic field of the adjacent conductor. During a short-circuit fault, the magnitude of this force scales with the square of the peak fault current and inversely with conductor spacing. At 50 kA peak, the force between two conductors spaced 50 mm apart reaches approximately 10,000 N/m — roughly one tonne per metre. This is the primary design load for cable cleat selection. Full derivation: What Is Short-Circuit Electromagnetic Force?
G
- Galvanic corrosion Corrosion mechanism
- Accelerated corrosion occurring when two dissimilar metals are in electrical contact in the presence of an electrolyte (seawater, condensation). The more active metal (anode) corrodes preferentially. Common examples in cable systems: carbon-steel bolts in a stainless-steel clamp body; aluminium clamp body with carbon-steel mounting bolts. Prevention: use matching or compatible metal grades for body and fasteners; use EPDM inserts to interrupt metallic contact between cable and clamp body where the cable sheath contains metallic elements.
H
- Hang-off clamp Offshore accessory
- A structural device that transfers the axial (weight) load of a suspended cable to the building structure at the point where a cable exits a J-tube or enters a vertical run from below. Unlike a standard cable cleat — which resists lateral electromagnetic force — a hang-off clamp is designed to carry the full weight of the cable span hanging below it. Requires a structural load calculation; typically a custom or project-specific item manufactured to the calculated axial load capacity. See: Cable Cleats at the J-Tube Transition.
- HS — Heavy Series DIN 3015 designation
- Product designation corresponding to DIN 3015 Part 2: twin-bolt pipe clamps with two bolts flanking the pipe. Provides higher clamping force and better vibration resistance than the LS single-bolt series. The correct series for main hydraulic supply and return lines at 160–250 bar, pump-adjacent piping, and all lines above 42 mm OD carrying pulsating flow. See: DIN 3015 Part 1, 2 and 3 Explained.
I
- ICCP — Impressed Current Cathodic Protection Offshore corrosion
- An active cathodic protection system in which a DC rectifier drives protective current from inert anodes attached to the structure into the seawater electrolyte, maintaining the structure at a protective potential. Used on large offshore wind foundations where sacrificial anodes would require replacement too frequently. Metallic cable cleat bodies near ICCP anode zones must be considered in the CP design; typically the requirement is to maintain electrical continuity between cleat body and structural steel (no insulating mounting washers) while the EPDM liner isolates the cable itself from the structure.
- IEC 61914 Standard
- International standard "Cable cleats for electrical installations." Defines test methods and performance requirements for cable cleats under short-circuit electromagnetic force. Tests include: application of a calculated peak electromagnetic force to a cleat sample; measurement of residual cable displacement and cleat deformation. A cleat compliant with IEC 61914 is rated to a specific peak current (in kA) and cable OD range — these two parameters must match the installation conditions. See: What Does IEC 61914 Actually Test?
- Isc — Prospective short-circuit current Electrical parameter
- The maximum root-mean-square (rms) current that would flow at a given point in an electrical system in the event of a bolted three-phase short-circuit fault — i.e., assuming zero fault impedance. Isc is determined from the network impedance at the fault point and is calculated by the electrical system designer. It is the starting parameter for cable cleat kA rating selection: the required cleat kA rating must be equal to or greater than the peak current ip derived from Isc using the peak factor κ. See also: peak current, κ.
J
- J-tube Offshore structure
- A curved steel conduit shaped like the letter J, mounted to the exterior or interior of an offshore wind turbine foundation (monopile, jacket leg or transition piece). The J-tube routes an export or inter-array power cable from the seabed approach angle up through the foundation into the tower. The curved lower section provides a smooth bend radius for the cable transition; the upper exit is fitted with a bell mouth and typically a bend stiffener. The cleat arrangement at the J-tube exit is among the most demanding in the installation. See: Cable Cleats at the J-Tube Transition.
K
- kA rating Cleat performance
- The peak short-circuit current (in kiloamperes) to which a cable cleat has been tested and certified under IEC 61914. A cleat rated at, for example, 40 kA has withstood the electromagnetic impulse force equivalent to a 40 kA peak fault current without exceeding the displacement and deformation limits of the standard. The kA rating is specific to a cable OD range and trefoil or flat formation. It must equal or exceed the calculated peak current ip at the installation point.
- κ (kappa) — Peak factor Electrical parameter
- A dimensionless multiplier that relates the peak (instantaneous maximum) short-circuit current ip to the rms prospective short-circuit current Isc: ip = κ · √2 · Isc. κ depends on the X/R ratio (reactance to resistance ratio) of the circuit at the fault point. For conservative design with typical industrial X/R ratios, κ is commonly taken as 1.8–2.0; in high-voltage transmission networks it approaches 2.55. IEC 60909 provides the calculation procedure. A simplified maximum value of κ = 2.5 (equivalent to ip = 2.5 · √2 · Isc / √2 ≈ 2.5 · Isc for peak) is sometimes used for conservative specification.
L
- LS — Light Series DIN 3015 designation
- Product designation corresponding to DIN 3015 Part 1: single central-bolt pipe clamps. Compact geometry suited to control lines, pilot lines and instrumentation lines where space is limited and operating pressures are moderate. For main high-pressure hydraulic circuits or pipe OD above approximately 42 mm with pulsating flow, the HS (Heavy Series) is preferred. See: DIN 3015 Part 1, 2 and 3 Explained.
- LSZH — Low Smoke Zero Halogen Fire performance
- A fire-performance classification for cable and cable accessory materials. LSZH materials, when exposed to fire, release minimal smoke (low opacity) and no halogenic acid gases (no HCl, HBr, HF). Required in offshore platforms, ship installations and enclosed spaces where evacuation routes must remain navigable during a fire event. LSZH is a distinct attribute from fire resistance class — a component may be LSZH-rated without being fire-rated, or fire-rated without being LSZH; both may be required simultaneously for some project specifications.
N
- NBR — Nitrile Butadiene Rubber Liner material
- An elastomeric material with excellent resistance to petroleum-based oils, fuels and hydraulic fluids. The preferred insert/liner material where the cable or pipe outer surface may come into contact with mineral oil — for example, in engine rooms or near oil-filled equipment. Not suitable for prolonged outdoor or marine use where ozone, UV and seawater exposure occur; EPDM is preferred in those environments. When oil contact and marine exposure both apply, consult material compatibility data for the specific fluid and exposure combination.
- Non-magnetic Material property
- A material property indicating negligible magnetic permeability (µr ≈ 1). Required for cable cleats securing single-core AC cables because a ferromagnetic cleat body creates an induction path that causes eddy-current heating in the cleat, reducing current-carrying capacity of the cable and wasting energy. Austenitic stainless steel (316L), aluminium alloy and engineering nylon are all non-magnetic. Carbon steel and ferritic stainless steels (e.g. 430 grade) are magnetic and must not be used for single-core AC cable cleats. See: Trefoil Formation for Single-Core Cables.
P
- PA66-GF — Glass-Fibre Reinforced Polyamide 66 Material
- The standard engineering polymer used for cable cleat bodies in light-duty and onshore applications. Glass-fibre reinforcement (typically 25–30 % by weight) significantly increases tensile strength and stiffness compared to unfilled PA66. Key properties: lightweight, non-magnetic, electrically insulating, corrosion-immune, operating temperature −40 °C to approximately 100–120 °C (grade-dependent). Not suitable for high-temperature zones (converter rooms), offshore C5-M environments, or applications where UV stabilisation is required unless the UV-stabilised grade is specifically specified.
- Peak current (ip) Electrical parameter
- The instantaneous maximum value of the short-circuit current, occurring at approximately one half-cycle after fault initiation. The peak current determines the maximum electromagnetic force impulse on cables and cleats. Calculated as ip = κ · √2 · Isc where Isc is the prospective short-circuit current and κ is the peak factor. This is the current value that must be used when selecting cable cleat kA ratings — not the rms value Isc. See also: Isc, κ.
S
- 316L stainless steel Material
- An austenitic stainless steel alloy containing approximately 16–18 % chromium, 10–14 % nickel, and 2–3 % molybdenum. The "L" designation denotes low carbon content (≤ 0.03 %), reducing sensitisation risk in weld heat-affected zones. The molybdenum content provides significantly better resistance to chloride-induced pitting and crevice corrosion than 304/316 standard grades, making 316L the baseline material for all cable cleats in offshore (C5-M) environments. Non-magnetic in the austenitic condition — compatible with single-core AC cable installations.
- Short-circuit current Electrical parameter
- The abnormally high current flowing through a circuit when a fault of near-zero impedance occurs between conductors or between a conductor and earth. In wind turbine electrical systems, the relevant short-circuit scenario for cable cleat design is typically a three-phase bolted fault at the point of cable cleat installation. The prospective value (Isc) is determined from network impedance calculations; the peak value (ip) incorporates the DC offset transient via the peak factor κ. Short-circuit current magnitude, not normal load current, governs cable cleat selection.
- Spacing (cable cleat) Installation parameter
- The centre-to-centre distance between adjacent cable cleats along a cable run. Shorter spacing reduces the electromagnetic force that each cleat must resist (by reducing the unsupported cable span and thus the bending moment), at the cost of more cleats. Spacing is not a site estimate: it must be calculated from the peak short-circuit current, cable mass per unit length, cable OD and the kA rating of the selected cleat. IEC 61914 provides the methodology; the result is a maximum permitted spacing. In practice, cleat spacing in wind turbine towers is typically 300–900 mm depending on circuit rating. See: How to Determine Cable Cleat Installation Spacing.
T
- Trefoil formation Cable arrangement
- An arrangement of three single-core cables in a triangular cross-section pattern — two cables side by side with the third centred above or below — resembling a three-leaf clover (trefoil). This arrangement is required for single-core AC cables to equalise the inductance of the three phases, balance current sharing, and reduce the net electromagnetic force on the cable bundle compared to flat (single-plane) formation. Cable cleats for trefoil formation must maintain the triangular geometry and are rated specifically for this arrangement under IEC 61914. See: Trefoil Formation for Single-Core Cables.
U
- UV-stabilised Material property
- A material property indicating that UV-absorbing or UV-blocking additives have been incorporated into a polymer (PA66, EPDM, polyurethane) to resist degradation from ultraviolet radiation. Without stabilisation, UV exposure causes polymer chain scission, surface chalking, brittleness and ultimately mechanical failure. Required for any polymer cable cleat body or elastomeric liner installed in locations with direct or indirect sunlight exposure — near tower access doors, maintenance hatches, or any outdoor routing. UV-stabilised grade must be explicitly specified; standard nylon or standard EPDM without UV stabilisation does not satisfy this requirement.