Tradies people have an advantage due to being able to transition from their standards knowledge base into the fire standards. As a Plumber or electrician, these skills remove the need to hire licenced contractors for some of the works such as Exit and emergency light repairs and hydrant head replacements. Keeping more money in your pocket. Having physical skills and doing day to day tasks also assists in hanging fire extinguishers, mounting Fire Alarm Systems.
Even with a trade background state and territory legislation requires a cabling licence to be able to work on Fire Detection Systems. Depending on the training provider this is a short course and can be completed in a couple of days or for the full cabling licence which FCF don't require a full week to obtain an open licence.