Hi all,

I have a newer home built in 2003 with a 200 amp service. I have an
espresso machine that has a PID controller installed on it... The
controller switches the water boiler power on and off about once a
second to maintain a certain boiler temperature in the machine...

The small espresso machine appliace has a 1100w boiler.. the appliance
draws 8-10amps. When the PID controller flips the boiler power of this
device on and off in 1 second intervals, I notice all the incandescant
lights in my house tend to pulsate along with the power switching from
this small 8-10 amp device...

The device is plugged into a 20 amp circuit. There are only 2 outlets
on this circuit, and the other outlet is not used...

Now please also understand that the "pulsating" is very hard to
notice... it is more pronounced in the lighting runs furthest from my
electrical panel where it is just barely noticeable. I just happened
to put two and two together a few days after I started using this PID
device when I was in the shower one morning and barely awake.. I
thought it was just me at first but on further investigation, linked it
up with the on/off cycle of the espresso machine. On my can lights in
the kitchen (a run closer to my panel), I really have to concentrate to
actually notice it. I probably would not notice if it were not for the
pulsating rythmic effect generated by the once per second switching.

On other lighting close to the panel, it is either hardly noticable or
non-existant.

Is it common or acceptable for lighting on other circuits to feel the
effects of a small device such as this? Is this something I need to be
concerned about or is it just a minor annoyance...

Thanks for any advice you can offer..

Tony B.