40 RATING OF ELECTRICAL MACHINERY 



Appendices H and I give compaiisons of methods of rating electrical 

 machinery, and particularly of D-C. machinery, in different countries, 

 as compiled by the Secretary of the International Electrotechnical Com- 

 mission. See Publication No. 9, " Rating of Electrical Machinery," of 

 the I. E. C. August, 1911. 



APPENDIX H. RATING OF ELECTRICAL MACHIM-KY 

 The following are the comparative rules on the rating 01 irrcnt 



generators and motors as compiled by the General Secretary of the 

 International Electrotechnical Commission from the National Rules of 

 six countries as in force in 1911. These comparative rules have been 

 appended to the Standardization Rules by order of the Board of Directors 

 ol the American Institute of Electrical Engineers, in order to present the 

 extent of agreement or diversity existing on these nil- l''ll, among 



the leading electrical engineering societies of the world. 



List of documents from which extracts have been made: 



BELGIUM. " Prescriptions normales " for the reception of electrical 

 machines and transformers issued by the " Chambre syndicate des 

 Electriciens Beiges " in 1908. 



FRANCE. General instructions for the delivery and reception of elec- 

 trical machines and transforrm : by the " Union des Syndicats 

 de I'Electricite* " in 1910. 



Regulations for tenders, supply and testing of electrical machines and 

 transformers issued by the " Association Alsacicnne des Proprie*taires 

 d'Appareils * Vapeur," 1906. 



GERMANY. Standard rules for the utilization and testing of electrical 

 machines and transformers issued by the " Verband Deutscher Elektro- 

 techniker " in 1910. 



GREAT BRITAIN. Report of the British Engineering Standards 

 Committee on " Electrical Machinery " issued in 1907. 



SWEDEN. Rules for the testing and reception of electrical machines 

 and transformers issued by the " Association of Swedish Engineers " 

 in 1909. 



UNITED STATES. Standardization Rules of the American Institute 

 of Electrical Engineers as contained in its PROCEEDINGS, August, 1911. 



ANALYSIS OF THE RULES 



POWER 



Method of Expressing the Power of Electrical Machines 

 BELGIUM. 



Generators. Kw. at the machine terminals. 



Motors. ;anical horse power at the shaft (75 kg-m. per sec.) 



FRANCE. 



Generators. Kw. at the machine terminals. 



Motors. Kw. or horse power at the shaft (75 kg-m. per sec.). 



GERMANY. 



Generators. Kw. 



Motors. Horse power (75 kg-m. per sec. 736 \Y 



GREAT BRITAIN. 



Generators. Kw. 



Motors. B.h.p. (1 Brake horse power -746 W.). 



SWEDEN. 



Generators. Kw. 



Motors. Horse power (75 kg-m. per sec.). 



TED STATES. 



Generators. Kw. at the machine terminals. 



Motors. B.h.p. (746 W.) Preferably in kilowatts. 



NOTES. BELGIUM. Motor* usually have their power indicated as " H.P.." with 

 consequent confusion as to which is intended; the English b.h.p. being 746 watts, the 

 " cheval-vapeur " being equivalent to 736 watts. 



PRANCE. Toe Association Alsacienne still allow* the Poncelet of 100 kg-m. per sec. 



