What color is the binder for pairs 51-75 in a 100-pair cable?

Green

From wp2ahg:

Group:

• 01 - 25   Blue
  
• 26 - 50   Orange
  
• 51 - 75   Green
  
• 76 - 100 Brown

See Code of Federal Regulations, Title 7, Volume 11, Chapter XVII, Part 1755, Section 1755.390 RUS specification for filled telephone cables.

(a) Scope. (1) This section covers the requirements for filled telephone cables intended for direct burial installation either by trenching or by direct plowing, for underground application by placement in a duct, or for aerial installations by attachment to a support strand.

(i) The conductors are solid copper, individually insulated with an extruded solid insulating compound.

(ii) The insulated conductors are twisted into pairs which are then stranded or oscillated to form a cylindrical core.

(iii) For high frequency applications, the cable core may be separated into compartments with screening shields.

(iv) A moisture resistant filling compound is applied to the stranded conductors completely covering the insulated conductors and filling the interstices between pairs and units.

(v) The cable structure is completed by the application of suitable core wrapping material, a flooding compound, a shield or a shield/armor, and an overall plastic jacket.

• Group No. = 3
  
• Color of Bindings = White-GREEN
  
• Group Pair Count = 51-75
  

See the City Infrastructure site for the pdf chart titled OSP Color Code Charts.

Also, see the Caledonian-Cables site for the pdf chart Colour Codes & Cable Makeup.

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What is most important when routing cables in a mobile unit?

Assuring radio or electronics cables do not interfere with the normal operation of the vehicle.

From wp2ahg:

The radio and cables must not interfere with the normal operation of the vehicle. It would be unsafe to do so.

Cable length cut to exact length is a good idea, but doesn't trump the safe operation of the vehicle.

Being able to access the radio from outside the vehicle is unnecessary and possibly foolish.

Assuming cables are routed along the floorboard of the vehicle, concealing them under floor mats or carpeting is a good idea, but still does not trump the safe operation of the vehicle.

See the Science Direct site for the article on Cable Route.

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Why should you not use white or translucent plastic tie wraps on a radio tower?

UV radiation from the Sun deteriorates the plastic very quickly.

For more information, please see UV Solutions site for the article on UV Degradation Effects in Materials – An Elementary Overview

Also, see Craftech Industries site for the article on uv degradation of plastics and uv resistant additives

Please see Service Thread site for the article on The UV Resistance of Polypropylene and Polyester Explained

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What is the 6th pair color code in a 25 pair switchboard cable as is found in building telecommunications interconnections?

Red/Blue, Blue/Red.

Please see PBXBook site for the article 25 Pair Color Code

YouTube: View the video from the Telecom Training titled Telephone wire color code

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What tolerance off of plumb should a single base station radio rack be installed?

Just inside the bubble on a level.

For more information, please see MT Copeland site for the article on Plumb, Level, Square, and True: What They Mean and How to Measure

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What type of wire would connect an SSB automatic tuner to an insulated backstay

GTO-15 high-voltage cable.

For more information, please see Allied Wire and Cable site for the article on GTO-15 Neon Sign Wire

Also, example of the cable on West Marine site for the GTO 15 High Voltage Cable, 100' Spool

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