Comment by xkqd
7 months ago
Yes, anything that can conduct electricity in the wood will trigger the safety device. Pressure treated wood is often so wet with copper based preservatives that it’ll trigger the safety circuit. Old nails in wood, your finger, hand, etc will also do this.
And yes in general the blade and brake are both trashed because of the wild deacceleration forces that happen instantly. Frustrating when pressure treated wood causes this, humbling when your hand caused it.
Nails alone usually won't trigger the brake. The nail would also have to be in contact with something conductive or else there's nowhere for the current to go.