Extreme H07RN-F 90°C HOFR submersible flex

Extreme H07RN-F 90°C HOFR submersible flex is available in single or multicore formats. HOFR = heat & oil resistant, flame retardant rubber. They are designed for trailing or mobile power supply applications in extreme environments including submersion in water. Commonly used in generators, portable equipment, moving machinery, handling equipment & underwater pumps.

This cable is suitable for indoor or outdoor applications including in permanently submersed installations. For example in port areas, dams, drainage or water treatment works, water features, oily or refrigerated conditions.

These Extreme H07RN-F 90°C HOFR cables are an enhanced version of standard H07RN-F heavy duty rubber, The Extreme versions can be used at higher and lower temperatures than the standard. They also meet the requirements of H07RN8-F submersible pump cable. 

Type EM2 Thermosetting Rubber Properties: this self-extinguishing compound has excellent resistance to oxygen, UV, ozone & water and very good resistance to acids, alkalis & solvents. It also has excellent abrasion resistance.


Construction – Extreme H07RN-F 90°C HOFR
fine or extra-fine stranded electrolytic annealed copper conductors
type EI4 thermosetting rubber core insulation
black type EM2 thermosetting rubber outer sheath


Technical – Extreme H07RN-F 90°C HOFR
conductor make-up: class 5 (flexible fine stranded) or class 6 (extra-fine stranded)
– see Stranding/Resistance page
bend radius: 3-4x overall diameter (O/D) fixed, 6-8x O/D flexing
voltage rating: 450/750V operating, 2500V test
use up to 1000V acceptable in fixed protected assemblies
current rating: as per Extreme H07RN-F 90°C chart, see Current Ratings page 
temperature range: -25°C to +90°C flexible, -40°C to +90°C fixed
water resistance: exceeds tests for H07RN8-F, suitable for permanent submersion (AD8)
construction: according to EN 50525-2-21 and IEC 60245
flame retardant: according to IEC 60332-1-2
core identification: 2 cores = coloured to VDE 0293 without earth (green/yellow)
3-5 cores = as above with earth (inc. in core count), see Colour Codes page
7+ cores = numbered black cores with earth (inc. in core count)


A printable specification is available here: Extreme H07RN-F 90°C HOFR submersible flex.


A similar cable with standard rubber sheathing can be found here: H07RN-F heavy duty rubber


For more rubber flexible cables return to the Rubber or PUR Flex and Welding front page.


All measurements should be considered nominal and images for illustration purposes only. Although Central Cables Ltd has made every reasonable effort to ensure its accuracy, the information contained herein is subject to error or omission and to change without notice. In no event will Central Cables Ltd be liable for any damages whatsoever, arising in connection with the information described.