Discuss SPD in commercial offices in the UK Electrical Forum area at ElectriciansForums.net
Fair. Sorry for my part. And sorry to John for the comments.Can we not turn this thread into a --- for tat argument. Some posts have been removed.
Their problem, as you have done your bit.What happens if their electronic equipment still goes bang in a lighting storm
Don't know about cable TV, but traditional phone lines always had SPD at the master socket and there are standards for the sort of spikes that telecoms stuff should handle.Have other services as phone, cable tv adopted this too?
In a commercial set up the installation should be set up in zones, each one designed to step down the surge current to a tolerable level at the equipment.What happens if their electronic equipment still goes bang in a lighting storm
Nice idea, I'm surprised they wouldn't just stump up for a couple of finials, they tend to be a lot cheaper than the damaged caused by a strike.We had put some effort in to protecting it against induced lightning surges, but never thought it would have survived a direct hit!
This was not really planned for, and the bureaucracy of trying to get the institute to fit some protection (and find the budget to do so) was a problem. The building itself was protected, but the antenna was now the highest point.
So we made up a makeshift LPS using stuff from local hardware shops, in between ice-creams and coffees, and hopefully it will be OK for the future:
View attachment 86202
Ideally they would have had it done when the building LPS was updated at some point between our original installation and when we had to fix it. We saw the change in conductors, etc, but no thought about a point going above the antenna! There you goNice idea, I'm surprised they wouldn't just stump up for a couple of finials, they tend to be a lot cheaper than the damaged caused by a strike.
I thought if you covered the incommer the rest is just optional.In a commercial set up the installation should be set up in zones, each one designed to step down the surge current to a tolerable level at the equipment.
View attachment 86206
Same can be applied in domestic by using type 3 surge protected outlets.
others are also vulnerable to damage though data lines (cable TV coax, phone line, etc) so would need separate protection.
There is the incomer protection, and a second shield about 30 foot from the incomer. This may be anti-surge sockets on vulnerable equipment.I thought if you covered the incommer the rest is just optional.
I just looked at John Ward's Youtube vids on SPDs - has series of about five vids on SPDs, emphasising how essential it is. He goes into the zones aspect. Worth looking at.In a commercial set up the installation should be set up in zones, each one designed to step down the surge current to a tolerable level at the equipment.
It is less common now, as networking is mostly wireless or Ethernet (which is usually isolated and can take kV level spikes) within a building, and usually these days fibre between network switches in different buildings (or sometimes between floors of a building) which is to all intents and purposes immune to surges.That has always been my concern. OK SDP may save boiler pcb's and LED lights, but the expensive stuff is still vulnerable via data cables.
Having seen a hospital take a substantial lightning strike with a repair bill of circa £500,000 and about 4 - 5 days disruption there was a full risk assessment done on the future risk of it happening again the results of which concluded that the cost (around £600,000) of installing the necessary protection across the site versus the strike risk was not a viable spend having had no documented strikes in the previous 40 - 50 years and a calculated future strike risk of 1 sometime in the next 44 to 400 yearsSo what the guidance is saying Johnboy, do a risk assessment of clients electronic equipment (cost)and ask them isit worth it or not.
They should sign it too.
Got caught out on my NIC assessment in 2019 for not fitting them on a commercial job.
Sounds like the NIC trying to make a point and help the manufacturers sell more, I'm surprised the NIC are not insisting on professional indemnity for contractors in case they fit the wrong type of SPDNo, just stearnly told us to do risk assessments in future on an individual basis (ie, for the cost and hassle of doing the assessment and getting approval from the client NOT to fit it its just easier to go ahead and fit surge and charge a bit more for the job)
Anyone for efficacy insurance if the SPD fails to operate under surge / strike conditionsWhat happens if their electronic equipment still goes bang in a lighting storm
I've seen a lot of surge arrestors fitted on intruder alarm comms kit where the installer didn't bother to connect them to a suitable earth so it made them a bit uselessDon't know about cable TV, but traditional phone lines always had SPD at the master socket and there are standards for the sort of spikes that telecoms stuff should handle.
Though I suspect that has gone from newer systems. Probably BT, etc, treat the modems as disposable - they often don't update the crap software anyway!
I've worked on a number of sites with rooftop comms kit and while installing comms kit I got into the habit of doing a quick test on the LPS down lead after we had some interference problems on one site where all the comms cables going to a number of buildings were earthing the LPS at the indoor units because the LPS down lead connection to the earth rod was broken and this was on an LPS that had been tested and certified some 10 months earlier the customer was adamant that it was ok and waved the certificate at me so I got a spade out and exposed the corroded LPS earth connections and then had to more or less drag him out of his office across the site to show him the problem that we had foundIdeally they would have had it done when the building LPS was updated at some point between our original installation and when we had to fix it. We saw the change in conductors, etc, but no thought about a point going above the antenna! There you go
Our make-shift one is not ideal, as it would provide weak protection from some directions as not high enough and no time / spare cash to put in a couple of them. But it was the first direct hit in over 20 years so not that common.
Based on what risk assessment and likely hood of it actually happeningI just looked at John Ward's Youtube vids on SPDs - has series of about five vids on SPDs, emphasising how essential it is. He goes into the zones aspect. Worth looking at.
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