Quote:
Originally Posted by westom
First off, how do you know AC electric has any protection from that type of surge? If the UPS does protection, then post a UPS number that says so. Most UPSes have near zero protection. Just enough above zero so that a majority call it 100% protection.
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I should have mentioned this is a business (with a business cable modem). The main power feed into our building has a three phase lightning protector (Bowthorpe DSP600) connected directly to the main power ground coming in with the supply. It is not indicating a fault after the strike.
Within our computer room most devices are run from APC 1000 UPS'es that do have some basic transient protection (surge between conductors and ground). That protection is not going to protect against a direct lightning hit but the majority of lightning damage is due to induced surges not direct hits (numerically). We were about 200 m from the lightning strike.
Having a little experience in this area I think we will connect the ground of the VQ301 ourselves to a common ground for the IT equipment. Whilst this will do nothing to protect against direct lightning hits, but it is usually more important to keep everything as close to the same potential, when grounds bounce during a surge, rather than try to pin everything to a the best earth possible, which is difficult to do (especially one floor up), as you point out.