On 04/03/2025 17:23, Scott wrote:

I understand that coiling a flex carrying a high current can be
dangerous due to the potential for overheating. Can I assume that for
a lamp fitted with a 4 Watt bulb this is simply not an issue of any
concern?

It will be fine...


--
Cheers,

John.

/=================================================================\
| Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk | \=================================================================/

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I understand that coiling a flex carrying a high current can be
dangerous due to the potential for overheating. Can I assume that for
a lamp fitted with a 4 Watt bulb this is simply not an issue of any
concern?

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On 04/03/2025 18:06, John Rumm wrote:

On 04/03/2025 17:23, Scott wrote:

I understand that coiling a flex carrying a high current can be
dangerous due to the potential for overheating. Can I assume that for
a lamp fitted with a 4 Watt bulb this is simply not an issue of any
concern?

It will be fine...

At 50Hz (or 60 Hz as used in some countries) the heating effect for any reasonable non-industrial use can be ignored.

(I only mentioned industrial use because someone might be drawing 300
amps or something.)

--
Sam Plusnet

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On 04/03/2025 17:23, Scott wrote:

I understand that coiling a flex carrying a high current can be
dangerous due to the potential for overheating. Can I assume that for
a lamp fitted with a 4 Watt bulb this is simply not an issue of any
concern?

The issue is heat build-up, within the cable, due to resistive heating
of the cable cores. Basically, a cable, carrying near it's limit,
generates heat. Coiled up, the ability to dissipate the heat is greatly reduced, so the cable can melt.

Some wrongly assume the problem is induction, or inductive heating. A
4watt load, will not be a problem, the heating effect is tiny.

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On Tue, 4 Mar 2025 19:23:17 +0000, Harry Bloomfield Esq <harry.m1byt@outlook.com> wrote:

On 04/03/2025 17:23, Scott wrote:

I understand that coiling a flex carrying a high current can be
dangerous due to the potential for overheating. Can I assume that for
a lamp fitted with a 4 Watt bulb this is simply not an issue of any
concern?

The issue is heat build-up, within the cable, due to resistive heating
of the cable cores. Basically, a cable, carrying near it's limit,
generates heat. Coiled up, the ability to dissipate the heat is greatly >reduced, so the cable can melt.

Some wrongly assume the problem is induction, or inductive heating. A
4watt load, will not be a problem, the heating effect is tiny.

Thanks everyone for the answers.

--- SoupGate-Win32 v1.05
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Sam Plusnet <not@home.com> wrote:

On 04/03/2025 18:06, John Rumm wrote:

On 04/03/2025 17:23, Scott wrote:

I understand that coiling a flex carrying a high current can be
dangerous due to the potential for overheating. Can I assume that for
a lamp fitted with a 4 Watt bulb this is simply not an issue of any concern?

It will be fine...

At 50Hz (or 60 Hz as used in some countries) the heating effect for any reasonable non-industrial use can be ignored.

(I only mentioned industrial use because someone might be drawing 300 amps
or something.)

A 3kw electric fire through a coiled extension lead is a severe fire hazard. Somewhat less than industrial. 4w is inconsequential.

--
braind

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On 05/03/2025 00:48, me9 wrote:

Sam Plusnet <not@home.com> wrote:

On 04/03/2025 18:06, John Rumm wrote:

On 04/03/2025 17:23, Scott wrote:

I understand that coiling a flex carrying a high current can be
dangerous due to the potential for overheating. Can I assume that for
a lamp fitted with a 4 Watt bulb this is simply not an issue of any
concern?

It will be fine...

At 50Hz (or 60 Hz as used in some countries) the heating effect for any
reasonable non-industrial use can be ignored.

(I only mentioned industrial use because someone might be drawing 300 amps >> or something.)

A 3kw electric fire through a coiled extension lead is a severe fire hazard.

+1

Somewhat less than industrial. 4w is inconsequential.

+2

--
Microsoft : the best reason to go to Linux that ever existed.

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On 04/03/2025 18:59, Sam Plusnet wrote:

On 04/03/2025 18:06, John Rumm wrote:

On 04/03/2025 17:23, Scott wrote:

I understand that coiling a flex carrying a high current can be
dangerous due to the potential for overheating. Can I assume that for
a lamp fitted with a 4 Watt bulb this is simply not an issue of any
concern?

It will be fine...

At 50Hz (or 60 Hz as used in some countries) the heating effect for any reasonable non-industrial use can be ignored.

Not sure what the frequency has got to do with it. Coiled cable heating
is nothing to do with induction and everything to do with resistance.

(if you think about it, a flex has counter directional current flow in
the L&N, so no inductive effect)

(I only mentioned industrial use because someone might be drawing 300
amps or something.)

7 amp would likely be too much for a coiled 13A extension lead -
especially as most use somewhat undersized CSA flex.


--
Cheers,

John.

/=================================================================\
| Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk | \=================================================================/

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Sam Plusnet wrote:

At 50Hz (or 60 Hz as used in some countries) the heating effect for any reasonable non-industrial use can be ignored.

(I only mentioned industrial use because someone might be drawing 300
amps or something.)

I don't think caravan hook-ups allow 300A

<https://www.motorhomefun.co.uk/forum/threads/ehu-cables-%E2%80%A6-is-it-a-wind-up.243737/#post-4565850>

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On 05/03/2025 00:48, me9 wrote:

Sam Plusnet <not@home.com> wrote:

On 04/03/2025 18:06, John Rumm wrote:

On 04/03/2025 17:23, Scott wrote:

I understand that coiling a flex carrying a high current can be
dangerous due to the potential for overheating. Can I assume that for
a lamp fitted with a 4 Watt bulb this is simply not an issue of any
concern?

It will be fine...

At 50Hz (or 60 Hz as used in some countries) the heating effect for any
reasonable non-industrial use can be ignored.

(I only mentioned industrial use because someone might be drawing 300 amps >> or something.)

A 3kw electric fire through a coiled extension lead is a severe fire hazard. Somewhat less than industrial. 4w is inconsequential.

Many cable reels today have a thermal cut-out to protect against coiled
use. I often use one of my cable reels coiled, but only for short
periods such as drilling or sawing, unrolling all 120ft of it in one
location would be a trip hazard.

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