The other day while our technicians were out perfroming an annual fire alarm inspection they came across something very interesting. The BOSCH fire alarm control panel had a fault reading on one of the three waterflow switches. They went to the device and found that an electrician had pulled out the hot switch leg for the water flow switch fire alarm bell. While the hot wires were pulled through the 3/4" flexible conduit it arched and completely fried the contacts within the water flow switch.
By doing this they had back fed our addressable fire alarm panel and burnt up the D7039 addressable multiplex card. Odds would have it that we did not have sufficient stock of this part so it had to be ordered. Now the site is on fire watch and the electrician has a nice sized back charge coming his way.
If you are lazy or not sure of what you are doing ASK! A simple project for this particular electrician cost everyone a lot of money and stress. This whole mess could have simply been avoided if he would have just shut off the breaker to the fire alarm bell. A 10 second step.
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