Harold, Wiremold makes their own connectors for splices within their product.
The wiremold splices are similar to crimpable butt splices, except that they are push-ins. They sure make things easier within wiremold!
Though I kept them on the truck, I never thought to use them elsewhere. Why would I? I was under the impression that you simply were not allowed to pull a splice into pipe. Now Ideal has me questioning myself.