Editing Ringer equivalence number (section)

==International specifications==
[[File:Aansluitfactor.jpg|thumb|In the Netherlands all telephone equipment shall carry a blue label with the ringer equivalence number - in this case 1.5]]
In the [[United Kingdom]] a maximum of 4 is allowed on any [[British Telecom]] (BT) line.<ref>{{cite web|url=http://www.britishtelephones.com/ren.htm|title=Ringer Equivalence Number (REN)|last=Anon|publisher=BOBS TELEPHONE FILE|access-date=28 May 2015}}</ref>

In [[Australia]] a maximum of 3 is allowed on any [[Telstra]] or [[Optus]] Line.<ref>{{Cite book|url=https://www.telstra.com.au/content/dam/tcom/personal/help/pdf-b/017153a00-complete-home-cabling-guide.pdf |archive-url=https://ghostarchive.org/archive/20221009/https://www.telstra.com.au/content/dam/tcom/personal/help/pdf-b/017153a00-complete-home-cabling-guide.pdf |archive-date=2022-10-09 |url-status=live|title=Cabling of premises for telecommunications – A complete guide to home cabling|date=26 August 2013|publisher=Telstra Corporation|page=182}}</ref>

In Canada it is called a ''load number'' (LN); which must not exceed 100.  The LN of each device represents the percentage of total load allowed.{{citation needed|date=January 2014}}

In Europe 1 REN used to be equivalent to an 1800 Ω resistor in series with a 1 μF capacitor.  The latest [[ETSI]] specification (2003–09) calls for 1 REN to be greater than 16 kΩ at 25&nbsp;Hz and 50&nbsp;Hz.