Sec. 68.304  Leakage current limitations.

    Registered terminal equipment and registered protective circuitry 
shall assure that, if a voltage source is connected to the combinations 
listed in the table below, of the following points on such equipment:
    (a) All telephone connections,
    (b) All power connections,
    (c) All possible combinations of exposed conductive surfaces on the 
exterior of such equipment or circuitry excluding terminals for 
connection to other terminal equipment,
    (d) All terminals for connection to nonregistered equipment,
    (e) Points having a conducting path to the secondaries of any power 
supply,
    (f) All auxiliary lead terminals, and
    (g) All E&M lead terminals,
    (h) All PR, PC, CY1 and CY2 leads,

and is gradually increased, from zero to the values listed in the table 
below, over a thirty second time period, then applied continuously for 
one minute, the current in the mesh formed by the voltage source and 
these points shall not exceed 10 milliamperes peak at any time during 
this 90 second time interval.

   Voltage Applied for Various Combinations of Electrical Connections   
------------------------------------------------------------------------
               Voltage sources connected between                 Value* 
------------------------------------------------------------------------
  (a) and (c) note (5)........................................      1000
  (a) and (d) note (5)........................................      1000
  (a) and (f) note (5)........................................      1000
  (a) and (g) note (5)........................................      1000

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  (a) and (h) note (6)........................................      1000
  (b) and (c).................................................      1500
  (b) and (d).................................................      1500
  (b) and (e).................................................      1500
  (b) and (h).................................................      1500
  (c) and (f).................................................      1000
  (c) and (g).................................................      1000
  (d) and (f).................................................      1000
  (d) and (g).................................................      1000
  (f) and (h).................................................      1000
------------------------------------------------------------------------
* Value to which test voltage is gradually increased, rms, 60 Hertz.    


    Notes:  (1) If, in any operational state, one of the telephone 
connections, auxiliary leads or E&M leads has an intentional conducting 
path to earth ground, that lead may be excluded from the leakage current 
test in that operational state. Connections excluded for this reason 
must comply with the requirements of Sec. 68.306(c) in addition to the 
other applicable rules. However, leakage current tests between telephone 
connections and auxiliary leads, and between telephone connections and 
E&M leads are required unless both points have intentional conducting 
paths to earth ground.
    (2) Terminal port connections to registered protective circuitry 
shall be treated as point (d) leads for the purposes of leakage current 
limitation.
    (3) Leakage current limitations shall be met between each of the 
point (d) and point (f) leads and all pairs of tip and ring telephone 
connections. (Testing all pairs may be done by a sequence of appropriate 
combinations of pairs.)
    (4) Equipment states which cannot be achieved by normal means of 
power shall be achieved artifically by appropriate means, if necessary 
to comply with the requirements of this section.
    (5) For multi-unit equipment interconnected by cables, which is 
evaluated and registered as an interconnected combination or assembly, 
the specified 10 milliamperes peak maximum leakage current limitation, 
other than between power connection points and other points, may be 
increased as described here to accommodate cable capacitance. The 
leakage current limitation may be increased to (10N+0.13L) milliamperes 
peak where L is the length of interconnecting cable in the leakage path 
in meters and N is the number of equipment units which the combination 
or assembly will place in parallel across a telephone connection. 
However, all combinations of electrical connections requiring the 
increased limitation and involving point (c) (exposed conductive 
surfaces) surfaces must comply with the requirements of Sec. 68.306(c) 
in addition to other applicable rules.
    (6) Leakage current limitations shall be met between each of the 
point (h) leads and all pairs of tip and ring telephone connections.


[ 45 FR 20853 , Mar. 31, 1980, as amended at  51 FR 944 , Jan. 9, 1986;  58 FR 44907 , Aug. 25, 1993]