Could someone please explain the difference between BW and CW glands for SWA? I thought it was that BW was for internal and CW for external use, but Screwfix sell BW rated IP66?
Screwfix # 19254 BW 20 gland IP66
Screwfix # 16877 BW20S gland IP66
Both of which say “BW” on the packets.
I am...