In-line fuse holders - do they meet the regs?
One for our resident certified electrical installers ...
I want to add a spur to feed a wall-mounted smart heating controller, which has a PSU as part of its wall-mount kit. I don't want to have a fused spur plate on the wall so am planning on putting an in-line fuseholder in the back-box for the wall-mount kit. I don't have any concerns about whether this is safe, but I can't decide whether it meets the regs or needs any specific labelling. Can anyone here provide the answer? FYI it's an Evohome system with an ATF600 wall-mount kit. |
In-line fuse holders - do they meet the regs?
In article ,
wrote: One for our resident certified electrical installers ... I want to add a spur to feed a wall-mounted smart heating controller, which has a PSU as part of its wall-mount kit. I don't want to have a fused spur plate on the wall so am planning on putting an in-line fuseholder in the back-box for the wall-mount kit. I don't have any concerns about whether this is safe, but I can't decide whether it meets the regs or needs any specific labelling. Can anyone here provide the answer? FYI it's an Evohome system with an ATF600 wall-mount kit. I'd say anything connected to a ring needs an FCU. Run it from the lighting circuit? -- *Being healthy is merely the slowest possible rate at which one can die. Dave Plowman London SW To e-mail, change noise into sound. |
In-line fuse holders - do they meet the regs?
On 13/12/2020 12:52, Dave Plowman (News) wrote:
In article , wrote: One for our resident certified electrical installers ... I want to add a spur to feed a wall-mounted smart heating controller, which has a PSU as part of its wall-mount kit. I don't want to have a fused spur plate on the wall so am planning on putting an in-line fuseholder in the back-box for the wall-mount kit. I don't have any concerns about whether this is safe, but I can't decide whether it meets the regs or needs any specific labelling. Can anyone here provide the answer? FYI it's an Evohome system with an ATF600 wall-mount kit. I'd say anything connected to a ring needs an FCU. Run it from the lighting circuit? You may be correct (I don't know) but the purpose of the fuse is to protect the (fixed) wiring between the device and the ring so what's the difference between an in-line fuse inside a back box and a fuse in a faceplate? I can accept that it would be useful to have a label saying "fuse inside", but I can't find anything in the regs; hence the question. The lighting circuits are too far away. |
In-line fuse holders - do they meet the regs?
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In-line fuse holders - do they meet the regs?
On 13/12/2020 15:17, Robin wrote:
On 13/12/2020 12:37, wrote: One for our resident certified electrical installers ... I want to add a spur to feed a wall-mounted smart heating controller, which has a PSU as part of its wall-mount kit. I don't want to have a fused spur plate on the wall so am planning on putting an in-line fuseholder in the back-box for the wall-mount kit. I don't have any concerns about whether this is safe, but I can't decide whether it meets the regs or needs any specific labelling. Can anyone here provide the answer? I'm not certifiable (yet) but have a couple of questions and comments. Perhaps I'm heading in the "certifiable" direction ;-) First, what if anything do the manufacturer's instructions require? There's nothing about protection Second, I am not clear what - if any - means of local switching and isolation you end up with.Â* An unswitched FCU to BS 1363-4 counts (Table Â* 537.4 in the regs): you can remove the fuse without risk to life and limb.Â* But what you propose ain't to BS 1363-4 and AFAICS could only remove the fuse by opening up the back box.Â* So I think that's a problem. You may be right but the fuse would only need replacing if the PSU fails, and that is in the back box. All connections would be insulated and I found an inline fuseholder with appropriate protections (although I can't find it now) so I think it meets the intent, but maybe not the letter, of the requirements. |
In-line fuse holders - do they meet the regs?
Brian Gaff wrote:
Has anyone ever opened up a wall wart recently? Time was when there used to be a fuse or at the very least a temp sensor in the transformer to stop it all bursting into flames. Many of the cheapo PSUs just use a low value resistor as the first component from the live terminal as a fuse now... |
In-line fuse holders - do they meet the regs?
On 14/12/2020 15:22, wrote:
On 13/12/2020 15:17, Robin wrote: On 13/12/2020 12:37, wrote: One for our resident certified electrical installers ... I want to add a spur to feed a wall-mounted smart heating controller, which has a PSU as part of its wall-mount kit. I don't want to have a fused spur plate on the wall so am planning on putting an in-line fuseholder in the back-box for the wall-mount kit. I don't have any concerns about whether this is safe, but I can't decide whether it meets the regs or needs any specific labelling. Can anyone here provide the answer? I'm not certifiable (yet) but have a couple of questions and comments. Perhaps I'm heading in the "certifiable" direction ;-) First, what if anything do the manufacturer's instructions require? There's nothing about protection Second, I am not clear what - if any - means of local switching and isolation you end up with.Â* An unswitched FCU to BS 1363-4 counts (Table Â*Â* 537.4 in the regs): you can remove the fuse without risk to life and limb.Â* But what you propose ain't to BS 1363-4 and AFAICS could only remove the fuse by opening up the back box.Â* So I think that's a problem. You may be right but the fuse would only need replacing if the PSU fails, and that is in the back box. All connections would be insulated and I found an inline fuseholder with appropriate protections (although I can't find it now) so I think it meets the intent, but maybe not the letter, of the requirements. Following that thought chain, the fuse could be non-replaceable and considered part of the PSU. So something like https://www.ebay.co.uk/itm//323268286316 in two layers of heat-shrink. |
In-line fuse holders - do they meet the regs?
On 15/12/2020 11:08:09, wrote:
On 14/12/2020 15:22, wrote: On 13/12/2020 15:17, Robin wrote: On 13/12/2020 12:37, wrote: One for our resident certified electrical installers ... I want to add a spur to feed a wall-mounted smart heating controller, which has a PSU as part of its wall-mount kit. I don't want to have a fused spur plate on the wall so am planning on putting an in-line fuseholder in the back-box for the wall-mount kit. I don't have any concerns about whether this is safe, but I can't decide whether it meets the regs or needs any specific labelling. Can anyone here provide the answer? I'm not certifiable (yet) but have a couple of questions and comments. Perhaps I'm heading in the "certifiable" direction ;-) First, what if anything do the manufacturer's instructions require? There's nothing about protection Second, I am not clear what - if any - means of local switching and isolation you end up with.Â* An unswitched FCU to BS 1363-4 counts (Table Â*Â* 537.4 in the regs): you can remove the fuse without risk to life and limb.Â* But what you propose ain't to BS 1363-4 and AFAICS could only remove the fuse by opening up the back box.Â* So I think that's a problem. You may be right but the fuse would only need replacing if the PSU fails, and that is in the back box. All connections would be insulated and I found an inline fuseholder with appropriate protections (although I can't find it now) so I think it meets the intent, but maybe not the letter, of the requirements. Following that thought chain, the fuse could be non-replaceable and considered part of the PSU. So something like https://www.ebay.co.uk/itm//323268286316 in two layers of heat-shrink. You ought to be able to isolate the PSU, ideally with a DPST swtich so I don't see why you are so against a switched FCU. It doesn't have to be co-located with the PSU as long as it's still accessible. |
In-line fuse holders - do they meet the regs?
On 15/12/2020 11:53, Fredxx wrote:
On 15/12/2020 11:08:09, wrote: On 14/12/2020 15:22, wrote: On 13/12/2020 15:17, Robin wrote: On 13/12/2020 12:37, wrote: One for our resident certified electrical installers ... I want to add a spur to feed a wall-mounted smart heating controller, which has a PSU as part of its wall-mount kit. I don't want to have a fused spur plate on the wall so am planning on putting an in-line fuseholder in the back-box for the wall-mount kit. I don't have any concerns about whether this is safe, but I can't decide whether it meets the regs or needs any specific labelling. Can anyone here provide the answer? I'm not certifiable (yet) but have a couple of questions and comments. Perhaps I'm heading in the "certifiable" direction ;-) First, what if anything do the manufacturer's instructions require? There's nothing about protection Second, I am not clear what - if any - means of local switching and isolation you end up with.Â* An unswitched FCU to BS 1363-4 counts (Table Â*Â* 537.4 in the regs): you can remove the fuse without risk to life and limb.Â* But what you propose ain't to BS 1363-4 and AFAICS could only remove the fuse by opening up the back box.Â* So I think that's a problem. You may be right but the fuse would only need replacing if the PSU fails, and that is in the back box. All connections would be insulated and I found an inline fuseholder with appropriate protections (although I can't find it now) so I think it meets the intent, but maybe not the letter, of the requirements. Following that thought chain, the fuse could be non-replaceable and considered part of the PSU. So something like https://www.ebay.co.uk/itm//323268286316 in two layers of heat-shrink. You ought to be able to isolate the PSU, ideally with a DPST swtich so I don't see why you are so against a switched FCU. It doesn't have to be co-located with the PSU as long as it's still accessible. Yes, I was trying to reduce "stuff" on the wall. In fact, because the controller is wifi-connected, I would probably get better range if the controller was remote from the PSU and any other metalwork. More thought required |
In-line fuse holders - do they meet the regs?
On 15/12/2020 11:08, wrote:
On 14/12/2020 15:22, wrote: On 13/12/2020 15:17, Robin wrote: On 13/12/2020 12:37, wrote: One for our resident certified electrical installers ... I want to add a spur to feed a wall-mounted smart heating controller, which has a PSU as part of its wall-mount kit. I don't want to have a fused spur plate on the wall so am planning on putting an in-line fuseholder in the back-box for the wall-mount kit. I don't have any concerns about whether this is safe, but I can't decide whether it meets the regs or needs any specific labelling. Can anyone here provide the answer? I'm not certifiable (yet) but have a couple of questions and comments. Perhaps I'm heading in the "certifiable" direction ;-) First, what if anything do the manufacturer's instructions require? There's nothing about protection Second, I am not clear what - if any - means of local switching and isolation you end up with.Â* An unswitched FCU to BS 1363-4 counts (Table Â*Â* 537.4 in the regs): you can remove the fuse without risk to life and limb.Â* But what you propose ain't to BS 1363-4 and AFAICS could only remove the fuse by opening up the back box.Â* So I think that's a problem. You may be right but the fuse would only need replacing if the PSU fails, and that is in the back box. All connections would be insulated and I found an inline fuseholder with appropriate protections (although I can't find it now) so I think it meets the intent, but maybe not the letter, of the requirements. Following that thought chain, the fuse could be non-replaceable and considered part of the PSU. So something like https://www.ebay.co.uk/itm//323268286316 in two layers of heat-shrink. If the manufacturer lays down no requirements and your only concern is to protect the cable (ie no local switching or isolation required) then ISTM you could just extend the ring final circuit to the PSU and avoid the need for a fuse altogether. Well, assuming the PSU's connectors can take 2 x 2.5 mm2 copper :) -- Robin reply-to address is (intended to be) valid |
In-line fuse holders - do they meet the regs?
On 15/12/2020 16:30, Robin wrote:
On 15/12/2020 11:08, wrote: On 14/12/2020 15:22, wrote: On 13/12/2020 15:17, Robin wrote: On 13/12/2020 12:37, wrote: One for our resident certified electrical installers ... I want to add a spur to feed a wall-mounted smart heating controller, which has a PSU as part of its wall-mount kit. I don't want to have a fused spur plate on the wall so am planning on putting an in-line fuseholder in the back-box for the wall-mount kit. I don't have any concerns about whether this is safe, but I can't decide whether it meets the regs or needs any specific labelling. Can anyone here provide the answer? I'm not certifiable (yet) but have a couple of questions and comments. Perhaps I'm heading in the "certifiable" direction ;-) First, what if anything do the manufacturer's instructions require? There's nothing about protection Second, I am not clear what - if any - means of local switching and isolation you end up with.Â* An unswitched FCU to BS 1363-4 counts (Table Â*Â* 537.4 in the regs): you can remove the fuse without risk to life and limb.Â* But what you propose ain't to BS 1363-4 and AFAICS could only remove the fuse by opening up the back box.Â* So I think that's a problem. You may be right but the fuse would only need replacing if the PSU fails, and that is in the back box. All connections would be insulated and I found an inline fuseholder with appropriate protections (although I can't find it now) so I think it meets the intent, but maybe not the letter, of the requirements. Following that thought chain, the fuse could be non-replaceable and considered part of the PSU. So something like https://www.ebay.co.uk/itm//323268286316 in two layers of heat-shrink. If the manufacturer lays down no requirements and your only concern is to protect the cable (ie no local switching or isolation required) then ISTM you could just extend the ring final circuit to the PSU and avoid the need for a fuse altogether.Â* Well, assuming the PSU's connectors can take 2 x 2.5 mm2 copper :) True, although that would be a case of something being "legal" but not sensible. |
In-line fuse holders - do they meet the regs?
In article ,
Robin wrote: If the manufacturer lays down no requirements and your only concern is to protect the cable (ie no local switching or isolation required) then ISTM you could just extend the ring final circuit to the PSU and avoid the need for a fuse altogether. Well, assuming the PSU's connectors can take 2 x 2.5 mm2 copper :) Can't think of any example of an appliance being wired in directly to a ring. All go via a plug or FCU. Very different from a radial. -- *Okay, who stopped the payment on my reality check? * Dave Plowman London SW To e-mail, change noise into sound. |
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