The main neutral connection must be tight and corrosion-free; a jeopardized neutral can trigger voltage imbalances

https://andycpyn530.ironwoodscope.com/posts/inside-the-electrical-panel-breakers-buss-bars-and-more

The primary neutral connection must be tight and corrosion-free; a compromised neutral can cause voltage imbalances, destructive appliances and delicate electronic devices.