What is H07RN-F Cable?
H07RN-F cable is a heavy-duty rubber flexible cable that is designed for electrical power supply that has a voltage rating of 450/750V. H07RN-F power cables are manufactured with a conductive copper core, ethylene propylene rubber (EPR) insulation and a polychloroprene (PCP) outer sheath. Therefore it provides high flexibility and is able to withstand chemical, mechanical and thermal stresses. H07RN-F cable is suitable for applications such as handling equipment, mobile power supplies, construction sites, stage and audio visual equipment, port areas and dams. Finally, h07 mains leads are considered heavy duty and flame retardant, as a result the leads are suitable for use in severe industrial environments.
What is the meaning of H07RN-F?
The definition of H07RN-F is a harmonised code according to the standard of the European Committee for Electrotechnical Standardisation (CENELEC) to provide a standardised specification for electrical leads:
- H – means conformity to harmonised standards
- 07 – identifies the voltage rating as 450/750V
- R – Refers to the EPR insulation
- N – Relates to the PCP outer sheath
- F – Indicates flexible copper conductors within
H07 or H07?
This type of electrical lead is sometimes misspelt as HO7RN-F, using the letter ‘O’ instead of a zero.
Power leads such as H07 are suitable for applications in a number of industries. Primarily, the rubber flexible cables are used as the supply of energy for portable mobile equipment or audio visual (AV) equipment.
Applications of H07RN-F:
- Handling equipment
- Mobile power generators
- Construction work sites
- Stage and audio visual equipment,
- Port areas and dams
- Mobile equipment (e.g welders and grinders)
Rubber Flexible Cable Specifications
Mains Cable Cores
H07RN-F is available with either a single core design or multi-core design. Typically, single core mains cables are used for higher current ratings as one line will be used for each of the three phases plus neutral and earth. Standard multi-core lines are available with 2 cores, 3 cores, 4 cores or 5 cores, however some manufacturers offer rubber flexible cable variants with up to 19 conductive cores.
- 2 core: Blue (Neutral) and Brown (Live Line 1)
- 3 core: Green/Yellow (Earth), Blue, Brown
- 4 core: Green/Yellow, Brown, Black (Live Line 2), Grey (Live Line 3)
- 5 core: Green/Yellow, Blue, Brown, Black, Grey
Ethylene Propylene Rubber Insulation
H07 Cable is insulated with an ethylene propylene rubber known as EPR. Ethylene propylene is a type of synthetic elastomer that is closely related to EPDM rubber. EPR is used in regularly used as electrical cable insulation, and in many flexible rubber goods such as hoses or weatherstripping. The material is considered a valuable elastomer due to its useful chemical and physical properties; it is resistant to heat, oxidation, ozone and the weather and it is also not susceptible to colour loss. As a non-polar compound, EPR is an electrical resistor and it is insoluble in many polar solvents, both protic and aprotic.
Neoprene (PCP) Sheath
These copper cables use tough rubber sheaths manufactured from neoprene (polychloroprene) which is often referred to as PCP. This material allows improved abrasion resistance and the ability to withstand many oils and chemicals, therefore neoprene sheathed H07RN-F cables are suitable for the most arduous conditions.
Flame Retardant Thermal Performance
The thermal performance of 450/750 volt wires can differ, therefore the below figures are based off Nexans TITANEX. As a renowned brand, TITANEX is flame retardant and operates at industry leading temperatures.
Maximum operating temperatures
- Fixed and protected installation: 90°C
- Mobile installation: 60°C
- In short-circuit: 200°C
The bend radius of H07RN-F cable can differ slightly from each manufacturer, therefore these figures are based off Nexans TITANEX.
- Dynamic Use Bend Radius: 6 to 8 x outer diameter
- Static Use Bend Radius: 3 x outer diameter (for Ø < 12 mm) or 4 x (for Ø > 12 mm)
There are 2 common types of termination for H07RN-F cables, crimp and set-screw. For low voltage electrical applications, lugs or single pole connectors are usually terminated for power transfer. The industry standard for safe connections on lead sizes over 35mm2 CSA is powerlock type connectors; Phase 3 use Powersafe. Powerlock cable terminations are available in the industry as lug-to-source, lug-to-drain or source-to-drain. Connectors can be crimped directly onto the copper conductor which is a permanent termination, alternatively set-screw can be applied for a temporary connection. M12 Lugs are also used for terminations to busbars, however they are not considered safe for exposed use due to the lack of insulation.
Cable Sizes & Weights
Trailing cables such as H07 come in a range of sizes and are often to referred to by their Cross Sectional Areas (CSA). Sizes range from 1.5mm2 to around 630mm2, as a result it is important to be aware of the amount of current required. Copper is a particularly heavy material, especially when compared to alternatives like Aluminium.
120mm single core cable is one of the most used in three phase electricity due to its high current ratings. In addition, its thickness and weight is more workable, so productivity and usability remains high. TITANEX 120mm leads will accept a current rating of 382 amps and will require termination with Powersafe 500A connectors.
240mm single core cable is one of the most used in three phase electricity due to its high current ratings. TITANEX 240mm leads will accept a current rating of 599 amps and will require termination with Powersafe 800A connectors.
Table of Single Core H07RN-F Cross Sectional Diameters and Weights
|Nominal Cross-Sectional Area||Nominal Overall Diameter mm||Nominal Weight kg/km|
The price of H07RN-F cable for the supply of energy differs greatly. Price is determined by the size of the core. In single core and multi-core variations, the price increases depending on the size of the copper conductor and prices can fluctuate depending on the price of copper in the London Metals Exchange (LME). For example, 1.5mm2 TITANEX pricing can start around 60p per-meter, whilst 120mm2 control leads can cost around £12 per-meter. All costing varies by manufacturer and supplier, so shop around to find the best deal for your installation. The benefit to a copper investment is that is often retains a high scrap value.
While all metals can conduct electricity, certain metals are more commonly used due to being highly conductive. The most common example is Copper (Cu). Copper is highly electrically conductive, as a result it is the most common metal for electrical wiring, in this case used for H07RN-F cable.
Surprisingly, copper is not even the most conductive metal despite being used in many common applications (and the fact it is used as the measuring stick for rating conductivity in metals). Pure Silver is more conductive but not as reliable over long time use, this is why you often see silver plating used on electrical contacts.
|Material IACS (International Annealed Copper Standard)|
|11||Steel (Stainless included)||3-15%|
|13||Nickel Aluminium Bronze||7%|
* Conductivity ratings are expressed as a relative measurement to copper. A 100% rating does not indicate no resistance.