[Code of Federal Regulations]
[Title 49, Volume 4]
[Revised as of October 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR236.108]

[Page 496]
 
                        TITLE 49--TRANSPORTATION
 
       CHAPTER II--FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF 
                             TRANSPORTATION
 
 PART 236--RULES, STANDARDS, AND INSTRUCTIONS GOVERNING THE INSTALLATION, INSPECTION, MAINTENANCE, AND REPAIR OF SIGNAL AND TRAIN CONTROL SYSTEMS, DEVICES, AND 
APPLIANCES--Table of Contents
 
             Subpart A--Rules and Instructions: All Systems
 
Sec. 236.108  Insulation resistance tests, wires in trunking and cables.

    (a) Insulation resistance of wires and cables, except wires 
connected directly to track rails, shall be tested when wires, cables, 
and insulation are dry. Insulation resistance tests shall be made 
between all conductors and ground, and between conductors in each 
multiple conductor cable, and between conductors in trunking, when wires 
or cables are installed and at least once every ten years thereafter.
    (b) Then insulation resistance of wire or cable is found to be less 
than 500,000 ohms, prompt action shall be taken to repair or replace the 
defective wire or cable and until such defective wire or cable is 
replaced, insulation resistance test shall be made annually.
    (c) In no case shall a circuit be permitted to function on a 
conductor having an insulation resistance to ground or between 
conductors of less than 200,000 ohms during the period required for 
repair or replacement.

[49 FR 3384, Jan. 26, 1984]