HTH

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Note added at 4 mins (2004-08-27 16:53:02 GMT)
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floor covering

Check out this site. It shows you exactly what a "gaine de sol" is!
http://www.vergokan.be/ndlsfrans/floorsearch/VGIS2.htm

In this case, as the cables are in the concrete slabs it is:
sub-floor cabling or under floor cabling or below floor cabling
as opposed to raised floor cabling or on the floor cabling

[PDF] Sun StorEdge Switch Installation Service “United States” 1. ...
Format de fichier: PDF/Adobe Acrobat - Version HTML
... must be located within the confines of a single room; • Cables will not be installed higher than the top of the Sun rack; • Below-floor cabling will only ...
www.sun.com/service/servicelist/ss/ sunstoredgeswitchinstallation-us-eng-20040602.pdf

cavity access computer floor raised flooring agent and ... - [ Traduire cette page ]
... raised floors, access cavity floor, computer flooring systems, under-floor cavity, wholesalers agent, under-floor plenum, under floor cabling, cable flooring ...
www.mulder-hardenberg.com/raisedfloors.html

Data Management & Storage: how long? - [ Traduire cette page ]
... overhead cabling? A/C? fire? etc.... to approximate, a 4000 sq ft room with a 24 raised floor, sub-floor cabling, FM200 and Liebert 20ton air handlers will... ...
experts.about.com/q/2453/3484190.htm

I'm assuming your offices are in an office building, not in a corner of a ground-floor industrial plant, for ex., and so rather than being "ground ducts" these are in suspended floors, so "in-floor ducts" (to be differeniated from "underfloor ducts" which COULD be suspended beneath the soffit]. Otherwise simply "floor ducts", maybe.

The use of the existing in-floor duct system is permitted on the condition that any cables in the duct system that become redundant due to your new ...
madhaus.utcs.utoronto.ca/local/ standards/advisory_letter/qandatest.html