In recent years we have begun using large in line exhaust fans for large or multiple residential bathrooms. Often times one fan can effectively work for 2 bathrooms.
We do not install 3-way switches for the fans because sometimes the fans are so quiet that you cannot tell if it is on or off. Instead we will install 2 single pole switches , 1 per bathroom and wire them in parallel so that if either switch is on the fan will operate. I know this is common practice with many other contractors but I'm wondering if it is illegal? Could this be a violation of 310.4? I have never been flagged for this configuration.
Thank you.
