Proposed MVD cable routing

 4 cable bundles (2 each 5.5 meters long, 2 each 6.5 meters long) route from
 the MVD electronics through the top of the MVD rack to the 4 MVD motherboards 
 in 6" wide cable trays and then vertically along surface of the central magnet 
 pole pieces. The choice of 6" wide x 3" deep cable trays (the only size that 
 fits) contrains the cable bundle size to a ~3" diameter tube.  Two cable
 bundles fit in one tray.  Please refer to the following .gif files which 
 can be found at the following address:
 
      http://p25ext.lanl.gov/people/jan/mvd/cable_routing/
      
	mvd_assy1.gif	MVD rack, cable trays, cable tray supports, cable
      			bundles, cable bundle pole piece supports
	mvd_assy2.gif	add MVD air cooling tubes
	mvd_assy3.gif	add central magnet
	mvd_assy4.gif	mvd_assy1.gif with MVD assembly added
	mvd_assy5.gif	add MVD air cooling tubes
	mvd_assy6.gif   add nosecones
	mvd_assy7.gif   add central magnet
	
	

 Cable Bundle (1 of 4)
   Signal Cables
     7 each	3M 90101/20	20 conductor  | 
     7 each	3M 90101/26	26 conductor  | .025" pitch pleated foil
     7 each	3M 90101/36	36 conductor  | shielded cable, 30 AWG Cu
     2 each	3M 90101/40	40 conductor  | NEC 725, CL2, CSA: 150V
     2 each	3M 90101/50	50 conductor  |
  
   Power Cables
     8 each	Belden 9159	14 conductor    18AWG, 300V, NEC 800, CM
  
  
   Signals:   42 silicon bias voltages: 60V nominal, 120V/100 microAmp max
  	      all other voltages <5V
   Power:     <7.5V, 4 Amps max
   
   
 Issues:
      
   - Is the electrical rating of the 3M 90101 cables consistent with the 
       concept of 4 cable bundles (mixing the silicon bias voltage (60V nominal)
       cables with the data cables)?  If not, would the addition of a plastic 
       insulator wrap on the two bias voltage cables (one 50 conductor and
       one 40 conductor cable) be sufficient?
       
   - Is the fire rating of the 3M 90101 cable consistent with no "conduit" -
       just bare cable in the cable trays?  If not, a cover such as 
       Zippertubing Co. FEP teflon jacket could be added at a cost of $1600
       to $2000 ($0 is the preferred number as we have no obvious funds
       available for this purchase).  The Zippertubing product is plenum rated 
       and was approved for the TEC.