mcelec Posted October 14, 2015 Share Posted October 14, 2015 Morning, I'm out of the office so dont have a copy of the regs with me, I have a site meeting I'm about to go in to and they want to discuss the fixings of cables, as we have flagged up that a sysystem that we are commissioning is non compliant as the cables are fixed every 2 metres. So I need the BS number and reference ideally and the recommended spacings, of the top of my head 300mm horizontal and 400mm vertical normally we space metal ties out further (around every 900mm) and use plastic between, I can't recall what the standards say about this? Any help greatly appreciated. Quote Link to comment Share on other sites More sharing options...
mcelec Posted October 14, 2015 Author Share Posted October 14, 2015 BS5839 talks about adequate support, so the question is, in a closed ceiling space with no access is fixings at 500mm intervals with every second fixing being fire rated adequate, personally I think possibly so. BS7671 on site guide table 4A provides spacing, however this talks about cables in accessible positions, so if the cables are not accessible and unlikely to be disturbed then it is arguable that these minimum fixing spacings are not relevant? I'm looking for some input please. Quote Link to comment Share on other sites More sharing options...
AdrianMealing Posted October 14, 2015 Share Posted October 14, 2015 What about the new requirements for containment of cables in escape routes, does this come into play in your current situation? if it does then whether its accessible or not is irelevant i would think. Quote amealing@texe.com Head of Industry Affairs Visit Our Website Texecom Link to comment Share on other sites More sharing options...
MrHappy Posted October 14, 2015 Share Posted October 14, 2015 exit routes need metal fixings, IIRC the spacings ain't stated ? 5839 states spacings but your meant to fit as stated by the manufacture. Ventcroft say metal fixing- V 300mm H 400mm Tray 1500mm (I take "tray" to be supported inside a Horizontal a tray/ basket not vertical or under / outside) Quote Mr Veritas God Link to comment Share on other sites More sharing options...
AdrianMealing Posted October 14, 2015 Share Posted October 14, 2015 exit routes need metal fixings, IIRC the spacings ain't stated ? 5839 states spacings but your meant to fit as stated by the manufacture. Ventcroft say metal fixing- V 300mm H 400mm Tray 1500mm (I take "tray" to be supported inside a Horizontal a tray/ basket not vertical or under / outside) I was pretty sure the reg said escape routes and not exit routes. The reasons for this is, i believe, that not all escape routes are marked as an exit, for example a window. Quote amealing@texe.com Head of Industry Affairs Visit Our Website Texecom Link to comment Share on other sites More sharing options...
Rulland Posted October 14, 2015 Share Posted October 14, 2015 My NICEIC assessor basically told me'class everywhere as an escape route', reason being firemen etc would need access to every part of a building to retrieve bodies etc, ie, a body could be in the corner of a large room, no doors close, but a safe route would be required in all cases. Quote Link to comment Share on other sites More sharing options...
datadiffusion Posted October 14, 2015 Share Posted October 14, 2015 I guess you must have seen the Colston fire pics Adrian? Good to see all the cable in wire baskets tbh, but how the hell the fire got out of control like that I can't imagine... Quote So, I've decided to take my work back underground.... to stop it falling into the wrong hands Link to comment Share on other sites More sharing options...
AdrianMealing Posted October 14, 2015 Share Posted October 14, 2015 I guess you must have seen the Colston fire pics Adrian? Good to see all the cable in wire baskets tbh, but how the hell the fire got out of control like that I can't imagine... I was driving through the centre of town about 40 mins after it started, smoke everywhere Quote amealing@texe.com Head of Industry Affairs Visit Our Website Texecom Link to comment Share on other sites More sharing options...
datadiffusion Posted October 14, 2015 Share Posted October 14, 2015 Yeah the pics were incredible - I guess the building was just a preserved facia on a concrete shell because the FB were happy walking around on the 'floor' with half the roof burnt off... Corridors were nothing left and open to the sky, but cables in stainless baskets, mostly cables burnt to nothing by the looks! Quote So, I've decided to take my work back underground.... to stop it falling into the wrong hands Link to comment Share on other sites More sharing options...
Adi Posted October 14, 2015 Share Posted October 14, 2015 Fire resistant cable is not fire resistant unless supported by fire resistant fixings or supported by something fire resistant, ie, caable tray, purlins, brickwork ect... Clips are as above, every 300mm and this metal saddle on plastic conduit is a load of bollox, it does not hold the cable, ok to stop the cable swiinging aboutt to stop firemen being entangled but not to support the cable to be fire resistant. As for tthe new rule and containnment on escape routes, this does not apply to fire systems as such, as all fire cable should have been adequatley supported for years now. Nothing new iin the fire alarm world. ...and my keyboard is a cnut, lol Quote I really can't be ar**** with it anymore. Link to comment Share on other sites More sharing options...
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