Hi Frenchie, are you using a smartphone or a PC?

On the very odd occasions that we enter cable conductors through separate holes via a gland plate we usually drill the gland holes in a straight line and then cut a thin slot between them before fitting the glands; this prevents heating occuring from eddie currents. If the current involved is less than 60 Amps we don't generally worry about it to be honest, I've only ever encountered heating problems due to eddie currents with supplies in excess of 200Amps.