[Electric engineering.] . owable amount and the fuseswill blow. Fuses should be placed in each side of the pri-mary and they should be so mounted that they may beeasily replaced by the lineman. In order to accomplishthis, nearly all modern primary fuse blocks are made sothat the fuse holder may be entirely disconnected from theprimary mains when the fuse is being renewed. In otherwords, the fuse block is made to serve the purpose of aswitch as well as a fuse holder. In some cases these primaryfuse blocks are double-pole, but when the primary pres-sure is high, it is better to use two single-po
[Electric engineering.] . owable amount and the fuseswill blow. Fuses should be placed in each side of the pri-mary and they should be so mounted that they may beeasily replaced by the lineman. In order to accomplishthis, nearly all modern primary fuse blocks are made sothat the fuse holder may be entirely disconnected from theprimary mains when the fuse is being renewed. In otherwords, the fuse block is made to serve the purpose of aswitch as well as a fuse holder. In some cases these primaryfuse blocks are double-pole, but when the primary pres-sure is high, it is better to use two single-pole fuse blocks are not recommended for transformersof larger capacity than 2,500 watts. Above this size it is better to use a singleblock in each side. 72. Fig. 20 (a) showsa General Electricdouble-pole primaryswitch and fuse block,with one fuse holder (b)removed for replacinga fuse. The fuse liesin a deep slot c in theporcelain holder (b)and is fastened to theclips d, d. When theholder is in place, the. 7bL/ne 7b Transformer (a) Fig. 20. §14 ELECTRIC TRANSMISSION. 59 clips d, d engage with the terminals /, /, thus completingthe connection to the transformer primary. When a fuseis to be renewed, the porcelain base is pulled out and thelineman can replace the fuse without danger. 73. Fig. 21 shows a single-pole block made by the Stan-ley Company. In this case, the lid of the iron box is placedat the bottom and the fuse holder A is pulled out, thusbreaking connection with the terminals /, /. The fuse g
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