i.o.iiuxc. I'OR ■JF.f.r.riioNE ciRCi'irs 



277 



arc placed in ihc lowci- pail of tlic \aiill pcrmiuiiiu, the coil lerminal 

 still) cables to \h- hnnii^lil ii|) NcrlicalK' hehiiid the hori/oiital cable 

 runs and spliced lo llie trunk cables in such a \\a\' as to nn'uiniize 

 the dii'l'icullies of future work on the cables passint; throuL;!) the \ault. 

 The trunk cables enter the \anlt through ducts which ina\' be seen at 



Fig. 18 — Underground cable loading coil installation in Metropolitan area. Double- 

 deck vault having ultimate capacity of 14 large coil cases 



the top of the picture, and are supported on racks mounted on the 

 upper side walls of the vault. 



At present, a total of eight hxiding coil cases is installed in the 

 vault illustrated in Fig. 17. Only fi\e of these, however, appear in 

 the picture. The cases now in place contain a total of 645 loading 

 coils. The vault has space for six additional large cases, on which 

 basis it is estimated that this vault will ultimately contain about 

 2,400 coils. Some of the largest vaults are capaljle of accommodating 

 a total of 30 large cases containing a total of 9,000 coils. 



