Generally falling under affirmation, candle/lamp magic, or a work which is continually worked (i.e. poppets, jars, sachets, etc.).
In the case of candles, as above, you generally work one (set of) candle(s) for that particular work. It is beneficial to allow a work to manifest instead of doing a 'ritual' over and over to accomplish a single goal. Lamps, on the other hand, you would continually add oil to and it would be one work, just worked continuously. You wouldn't have three lamps going, unless they were covering different aspects of a situation.
Poppets, sachets, jars, and affirmations fall under the same aspect of lamps, they are crafted and worked until the work has been accomplished. Affirmations work on a more subtle level, but they work towards as a goal, as the others.
Now, to confront the idea of 'triple casting'. It can be undermining, especially, if done out of doubt in your tools and ability. Allow your working time to manifest, otherwise, you can impede yourself. Have confidence!