Arthur Edmund du Pasquier attended Westminster School, London, from 1888 to 1892 and then was apprenticed to the firm Crompton-Howell and Company of Llanelly, southern Wales. After completing his apprenticeship he remained with the firm, being mainly involved in the installation of electrical plant in the region. After a brief period with the DP Battery Company he was appointed manager at the Porvus Accumulator Company in 1898 and soon thereafter became general manager of the Marquand Accumulator Company. In October 1902 he joined the sales staff of the British Westinghouse Company (later the Metropolitan-Vickers Electrical Company) and was stationed first in South Wales and then in Scandinavia. After his return to the United Kingdom he worked for some time in the company's Export and Plant Departments.
In 1912 Du Pasquier presented a paper to the South Wales Institute of Engineers on "Electric winding engines: A comparison of systems and the influence of drum profile on the performance obtained", which was for a long time regarded as a classic on the subject. He became a member of the (British) Institution of Electrical Engineers in 1916.
Du Pasquier came to Johannesburg in 1915 to take charge of the South African affairs of the Metropolitan-Vickers Electrical Company. He became a member of the South African Institute of Electrical Engineers and was elected its president for 1919/20. His presidential address dealt with "The essential importance of our overseas trade", but he also contributed two technical papers to the institute's Transactions: "Guarantees for temperature rise in electrical machinery with special reference to large turbo-generators" (1918, Vol. 9(7), p. 127) and "Power requirements of rolling mills" (1920, Vol. 11(6), p. 104). He became a member of the South African Association for the Advancement of Science in 1917.
Returning to the United Kingdom in 1921, Du Pasquier was appointed manager of the Metropolitan-Vickers Publicity Department, a position he held until his death in 1933. His excellent work during this period was ensured by his unfailing tact, courtesy, helpfulness and energy, coupled with a high technical ability.