The ETCI down here doesn't allow a telephone or telephone socket in the bathroom. They suggest you bring a portable, battery powered, phone.
Voltages present on an Irish line:
On Hook:
14-58V DC
Maximum voltage for test purposes 250V DC
(current limited to 4mA into a 1k ohm resistor)
Ringing Signal:
Frequency 25Hz
Voltage :
Min: 35V
Max: 90V
However, on the public system (AXE and E10B switches) you usually find:
Frequency 25 Hz
40 V rms applied differentially on each leg, out of phase.
Cadence 0.375 s ON, 0.25s OFF,
0.375s ON, 2.0 s OFF repeated.
If caller ID is presented the first ring
will be 0.5 ON followed by 2sec second of silence.
PABXs/ISDN Terminals and other line sources may apply 70-90V to one leg only.. sometimes at anything from 20- 50Hz.
I wouldn't be overly concerned with a public line in a bathroom, except for test voltages...
~40V to ground from either wire when ringing
but 80-90V between the wires.
However, the ETCI don't consider Telephone network voltages SELV.
So, I guess normal bathroom regs would apply.
Interestingly, it's also recommended that you activate call divert to your mobile *21*moble no # before working on a phoneline...
[This message has been edited by djk (edited 01-09-2004).]
