[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: 49CFR234.267]

[Page 479]
 
                        TITLE 49--TRANSPORTATION
 
       CHAPTER II--FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF 
                             TRANSPORTATION
 
PART 234--GRADE CROSSING SIGNAL SYSTEM SAFETY--Table of Contents
 
             Subpart D--Maintenance, Inspection, and Testing
 
Sec. 234.267  Insulation resistance tests, wires in trunking and cables.

    (a) Insulation resistance tests shall be made when wires or cables 
are installed and at least once every ten years thereafter.
    (b) Insulation resistance tests shall be made between all conductors 
and ground, between conductors in each multiple conductor cable, and 
between conductors in trunking. Insulation resistance tests shall be 
performed when wires, cables, and insulation are dry.
    (c) Subject to paragraph (d) of this section, when 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. Until such defective wire or cable is replaced, insulation 
resistance tests shall be made annually.
    (d) A circuit with a conductor having an insulation resistance of 
less than 200,000 ohms shall not be used.
    (e) Required insulation resistance testing that does not conform to 
the required testing schedule of this section shall be completed in 
accordance with the following schedule:
    (1) Not less than 50% by the end of calendar year 1996;
    (2) Not less than a total of 75% by the end of calendar year 1997; 
and
    (3) One hundred percent by the end of calendar year 1998.