[Icom] Relay voltages

[Bruce Marton]

Hello,
I am currently using an IC 781.  The rated relay shorting voltage from the
amp is at 30 VDC maximum.
I am using a B&W PT 2500A, which has no information in the manual about the
t/r relay voltage and current at the RCA jack.  I looked at the schematic
and it shows the RCA jack passing through the main relay via the coil, that
is the relay that makes the T/R contact of the RF in and out either into the
amp or bypass to the antenna.  After it passes through the coil, it
continues on to a transistor which is probably the item that energizes the
relay when shorted.
I measured the voltage at the jack in standby then operate and it goes from
1 VDC to 12.5 VDC when switched into the operate position.
I am assuming the voltage of 12.5 VDC on the RCA jack for amp relay to be
connected to the IC 781 is safely within limits.  However,  is there any odd
currents or otherwise that could be spiked back through this line to the
Icom which would cause potential harm to the relay circuit in the exciter??

Would it be safe to use directly connected or would I be better to use an
amp relay interface between the two?  Is this unnecessary redundancy?

Thanks,
Bruce K1XR