[Elecraft] Feeding with 300 OHM Twin Lead in basement ceiling

[Norm Klieman]

I am thinking of feeding an end fed zepp using 300
twin lead for mh K1. My shack is in my basement. How
careful do I need to be with the twin lead around
ceiling conduits, pipes and air vents? Is there a good
rule of thumb for how many inches I need to stay away
from these items or am I just overthinking here??
Thank for the feedback!  73's -- Norm  K9NK