Yup...thats just what I mean...experts.....bah humbug!! D
On 01/08/2010 19:44:48, Eric Lemmon ([email protected]) wrote: > That is so true! When you add "corporate ego" to the mix, things get > really > murky. A case in point: Back in the mid-eighties, one very large and > well-known computer equipment manufacturer was contracted to install some > facility monitoring equipment at Space Launch Complex Six at Vandenberg > AFB, > a site that was to be (until the Challenger disaster) the west-coast > Space > Shuttle launch pad. The monitoring equipment was divided into two major > pieces, on separate floors of the Launch Control Center and about 200 > feet > apart. From the moment the system was energized, a number of data > channels > had 60 Hz common-mode noise corrupting the data on the RS-422 > circuits. > > My crew was attempting to investigate the noise issue, when we discovered > that the > supplier's technicians had deliberately "floated" the upstairs > cabinets by using insulating washers and plastic sheets to avoid contacting > any grounded facility items such as embedded rebar. When advised by our AHJ > (Authority Having Jurisdiction) inspector that the installation violated > Article 250 of the NEC, the manufacturer's > engineer explained that this was > the way his company did these installations, and- > here's the corporate ego > part- they had been doing%2
