In my project I need to control 2 relays from ESP-12E, I have isolated AC & DC side in my PCB design by 4mm
PCB Material : FR4, with general Silkscreen coating (green polymer coated)
According to this clearance calculator & studying other sources, clearance is 1.8mm & creepage is 2.5mm
Current required at output terminals : 4.5A, Voltage : 230Vac
Relay used : Hongfa 5Vdc 5A Subminiature relay - HF46F
Connected RC Snubber circuit in parallel with relay switching contact for protection
Question 1 : Do I need mentioned clearance & creepage distance between all of the AC voltage traces on my PCB ?
Just to elaborate the question : The current is flowing from LINE of terminal block then goes to Common of relay, then from NO of relay goes to Fuse terminal and parallel RC snubber circuit, then from fuse to again at output port of terminal block. So will all the traces of this path need to have calculated clearance-creepage with each other? or only needed at different voltages, components or paths?
Question 2 : Do the traces of RC snubber circuit needs same width as of relay-output traces(as same amount of current will flow through RC snubber)?
Question 3 : Is needed clearance in my design 1.8mm or 0.4 mm? From mentioned calculator image which value of clearance is appropriate, and from IPC2221A table my value comes around 'B4' Track-Track 0.4mm & 'A6' Track-Pad 0.8mm, so which is correct?