I have a socket that I was thinking of using to run an S9 on. The socket reads NENA L14-50-R 50A 125/250V
Can I get an adapter to plug one of the Bitmain 1600W Bitmain APW3++ PSU into it or is the socket running too much power at 50A to be safe?
first question did you buy the apw3+++ psu.
now to answer this question you asked.
50 amps are available at that plug
if you use 1500 watts at 240 volts for 1 antminer you are using 6.21 amps
you are correct to worry as a short in the psu could pull extra amps.
that what pdu's are used for they are fused and act as a saftey