Eliminator Construction

Radio Record, Volume III, Issue 41, 24 April 1930, Page 29

Eliminator Construction

A Word to the Wise ---- THE following warning with regard ' to radio apparatus connected to the electric light mains have beeu issued by the Wlectrie Supply Department in Sydney. It is of interest to New Zealand constructors as_ it emphasizes the care that must be taken during the making of home built power packs. In our descriptions care is taken that the specific actions, if followed, will ensure perfect safety and comply with New Zealand regulations. They should te followed carefully. The Sydney Department says most of the radio receiving apparatus which has been in usé until quite recently has depended, for its electric current, entirely on batteries. This apparatus even when constructed by amateurs is quite safe and suitable for operation by wireless enthusiasts. With the wireless apparatus now coming into use, current is generally obtained from the house lighting mains to operate battery eliminators, trickle chargers, and "allelectric" sets. This apparatus is equally safe if constructed in accordance with well-defined rules, and is connected in a permanent and workmanlike manner. Unfortunately some of this apparatus is constructed and connected in an improper manner by inexperienced persons. When constructing electrical apparatus intended for connecting to the house lighting mains, the following points should receive careful consideration: "The apparatus must be wired and connected in a permanent manner, or through a proper outlct. "All flexible conductors used for connecting to the supply must be of A grade-the type suitable for use on 280-volt installations. "The 230-volt terminals must he completely protected from accidental contact. Where the cases are of metal, they must be connected to earth wi l a stout wire having proper terminn:s at each end. This is most importnuc "Transformers intended for councetion direct to the house lighting mnins must be properly designed for their purposes with independent primary circuits and the covers and frams must be effectively connecivd 10 earth."