C.I.G.R.E. <br/><br/>
Reliable fault clearance and back-up protection. Working Group 34.01 Final Report. 

 - Paris  CIGRE  April 1999 
 - X+17.6-A1.1-A2.30 
<br/><br/><label>Universal Decimal Class. No.: </label>621.316.9  / CIG.99