Comments on: Are there any Telephone Line Technicians out there? http://www.batterybackupguide.com/blog/are-there-any-telephone-line-technicians-out-there/ Sat, 11 Feb 2012 07:25:18 +0000 http://wordpress.org/?v=2.7 hourly 1 By: Gerry http://www.batterybackupguide.com/blog/are-there-any-telephone-line-technicians-out-there/comment-page-1/#comment-1524 Gerry Mon, 09 Mar 2009 08:11:16 +0000 http://www.batterybackupguide.com/blog/are-there-any-telephone-line-technicians-out-there/#comment-1524 Telephone central offices contain switching and transmission equipment, which are powered by -48 Volts DC. The -ve polarity accommodates corrosion at sacrificial anodes in the CO basement. The batteries in these buildings are 48 volt and are usually large wet cells. Likewise, most radio systems are 24 volts. Used car batteries (ie 12 volt) might be your best option, if you can contain them in a spill-proof case. Telephone central offices contain switching and transmission equipment, which are powered by -48 Volts DC. The -ve polarity accommodates corrosion at sacrificial anodes in the CO basement. The batteries in these buildings are 48 volt and are usually large wet cells.

Likewise, most radio systems are 24 volts.

Used car batteries (ie 12 volt) might be your best option, if you can contain them in a spill-proof case.

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