Indian Standard : specification for AC electricity meters - part 7 volt-ampere hour meters for full power factor range  section 2 vector sum VAh meters 

 - New Delhi  Bureau of Indian Standards  1988 
 - 2p.  
<br/><br/> IS : 722 (part 7/sec 1) - 1987 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Indian Standards