Telephone Identification, Repair & Restoration > Technical "Stuff"

REN - Ringer Equivalency Numbers

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benhutcherson:
Hello Folks,
I posted this in another thread, but thought it was worth some discussion on its own.

I came across the following quote in a Singing Wires back issue

"The early 500s were plagued with transmission problems, and the ringers were (and remained) less efficient than their 302 predecessors."

I know that a C4A ringer is arbitrarily defined as having an REN of 1. If we take this to be true that the earlier ringers used in 302(I forget the number) were more efficient, does this also mean that the REN is less than 1?

I'd measure it myself, but don't have the necessary power supply to make them ring(and then measure the resultant current).


Thanks,
Ben

metdial:
I just looked at an auction on ebay for a WE 500 from 1962.  The seller (who claims to have over 35 yrs. in the phone industry) makes this statement in his description: 

"The bell is not wired for current usage, this can be changed but not advised due to heavy current drain that these units have."

Is the current required for one of these old ringers really that significant? 

Konrad:
I was looking at the same listing and scratched my head.

In the 1800's a German philosopher put forth that man learns nothing from history.  Ringer Voltage is measured in RENs Ringer Equivalency Numbers.  What is 1 REN.  The voltage used by a WE 500 Ringer.  I know modern phones use much less.

Considering that you can still lease a new 500 and there are huge numbers still out there on lease this is pure cods wallop. Even the latest and greatest in VOIP will run at least two WE 500 and push the voltage through house wiring to do it. Ma Bell could ring at least 4 phones and probably more.

Dan/Panther:
I have 3, 500's set on loud, on my Frontier landline, and they will wake the dead in the middle of the night !
D/P

BDM:

--- Quote from: Konrad on January 25, 2009, 09:27:37 AM ---I was looking at the same listing and scratched my head.

In the 1800's a German philosopher put forth that man learns nothing from history.  Ringer Voltage is measured in RENs Ringer Equivalency Numbers.  What is 1 REN.  The voltage used by a WE 500 Ringer.  I know modern phones use much less.

Considering that you can still lease a new 500 and there are huge numbers still out there on lease this is pure cods wallop. Even the latest and greatest in VOIP will run at least two WE 500 and push the voltage through house wiring to do it. Ma Bell could ring at least 4 phones and probably more.



--- End quote ---

I have five phones hooked to my VOIP modem. Ranging from 500 series down to bell boxed D1 mounts. No problems, which surprised me.

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