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StuM Newest Member · 15 hours ago15 hr

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Radial question

That's what I thought.

So aside from the slight oddity of a 32a outlet rather than a 16a or 13a in a 20a radial it looks allowable (and more importantly - safe)

By Beelbeebub · Just now1 min
Most flexible 6mm T&E

I may have found the answer, but this is from a Chinese company. No reference to BS.

Can H07RN-F Be Used for Fixed Installation?
The short answer:
👉 H07RN-F is primarily designed for flexible applications, not permanent fixed installation-but it may be used under certain conditions.
According to relevant standards (such as EN 50525 and VDE specifications), H07RN-F is classified as a flexible cable. Its main purpose is to supply power to movable or portable equipment.
However, many real-world projects blur the line between "temporary" and "fixed." That is why the correct answer is not a simple yes or no-it depends on how and where the cable is installed.

Why Is H07RN-F Usually Not Recommended for Fixed Installation?
From a technical and regulatory perspective, H07RN-F has limitations when used as a permanently fixed cable.
Conductor Design
Fine stranded conductors are optimized for flexibility
Long-term fixed installation may cause stress concentration at termination points
Mechanical & Thermal Considerations
Fixed installations may involve continuous clamping, bending radius limitations, or thermal buildup
Flexible cables are more sensitive to long-term compression and strain
Compliance Risks
In many regions, inspectors expect dedicated fixed-installation cables (e.g. NYY, YJV)
Using flexible cables improperly may result in:
Failed inspections
Safety concerns
Higher maintenance or replacement costs
For these reasons, H07RN-F is generally not the first recommendation for fixed wiring systems.
When Can H07RN-F Be Used for "Semi-Fixed" Installation?
Despite the limitations, H07RN-F can be used in certain quasi-fixed or semi-fixed scenarios, provided specific conditions are met.
Acceptable Conditions Include:
Short installation lengths
Visible or open installation (not embedded in walls or concrete)
No continuous mechanical stress or vibration
Additional mechanical protection (e.g. conduits, trays)
Compliance with local electrical regulations
Typical Examples:
Power supply connections to industrial equipment
Machine tail cables
Temporary systems that later become long-term but remain accessible
In these cases, H07RN-F offers durability and flexibility while maintaining acceptable safety levels.
Common Customer Misunderstandings & Risk Warnings
As a professional cable manufacturer, we often see these misconceptions:
Common Mistakes:
"Rubber sheath means it can be used anywhere permanently"
"If the cable is thick enough, it must be safe"
"Everyone uses it, so it must be compliant"
Potential Risks:
Regulatory non-compliance
Increased failure rates over time
Unexpected replacement or retrofit costs

By Gone West · 46 minutes ago46 min
Please Check Your Ecodan Installation (Immersion Heater)

Is the legionella cycle really doing all the job by just heating the tank what is happening in all the dead legs such as expansion vessels. I read this a couple of years ago which sets out the challenge, mainly for commercial buildings but the same effects must be present in domestic situations.

By MikeSharp01 · 1 hour ago1 hr
Radial question

Yes, no need for PEN fault protection on TT systems with no other potential TN systems in close proximity.

By Mattg4321 · 2 hours ago2 hr
Please Check Your Ecodan Installation (Immersion Heater)

I would go with JohnMo on the 60C point. If the cycle is actually reaching temperature and the water is being turned over regularly, I would not chase a higher setting just for the sake of it. The useful check for me is the one you found, making sure the immersion is actually able to finish the cycle rather than assuming it has.

By stevenlee · 6 hours ago6 hr

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BuildHub Guide: Information about the site : Introduce Yourself

Build Design, Planning, Finance and Legal

House Construction & Structural Issues

Building Trades

Environmental, Alternative & Green Building Methods

Self Build & DIY: General

Self Build Regional Groups