MANUFACTURING LEAD-COVERED TELEPHONE CABLE 327 



The specified limiting degree of unbalance of the capacitance in 

 quadded cable is indicated in Table 2, and Fig. 7 is a diagram showing 

 the capacitances involved and a brief explanation of them. 



AGROUND 



,1' GROUND 



■^GROUND 



Fig. 7 — Diagram showing the capacities involved in capacity unbalances 



between circuits 



TABLE 2 



1 Class I Unbalances — Phantom to Side 



1, 2, 3 and 4 represent the four wires of a quad, of which 1 and 2 form one pair and 3 

 and 4 form the other pair. 



Unbalance between Phantom and Side 1-2 = 2[Ci_3+Ci_4 — (C2_j+C2-4)]+Gi— G2 

 Unbalance between Phantom and Side 3-4 = 2[Ci_3+C2-3 — (Ci_i+C2_4)i]+G3 — G4 



Class II Unbalances — Side to Side 



1, 2, 3 and 4 represent the same as in Class I Unbalances. 



Unbalance between Side 1-2 and Side 3-4 = Ci_4+C2-3 — (Ci_3+C2_4) 



1 Capacitance Unbalances involve differences of Direct Capacitances. See G. A. 

 Campbell, Bell System Technical Journal, July 1922. 



