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Best Answer: w/w- an abbreviation for by weight, used in chemistry and pharmacology to describe the concentration of a substance in a mixture or solution ...
The added W stands for water resistant so that it could be installed outdoors and in conduit when THHN wire could not. However, again, remember that they're all combined into a universal wire now. If you buy THHN wire on our website it will have all of the attributes of each acronym discussed on this page. THW Wire Thermoplastic, Heat and water resistant wire. This acronym is missing the N for nylon coated. The nylon coating looks like the little piece of plastic over a shoe lace and protects the wire in a similar fashion.