The panel I inspected yesterday was a 150 amp split-bus configuration. The panel had numerous deficiencies (more than six disconnects, double taps, double neutrals, etc.), but it also had a surge arrestor installed.
This surge arrestor was installed on the 40 amp disconnect for the electric range. Plus, it was connected directly to the terminals (double tap).
So, my question is this:
Why would the surge arrestor be installed on just the 40 amp breaker to the range? Wouldn’t it be better for the arrestor to be installed on the main lighting disconnect breaker?
Since this is a split bus panel, installing the arrestor on the just the 40 amp range disconnect would not provide protection for the rest of the panel, would it? I always thought that if you install a surge arrestor on a single bus panel that the entire panel is protected no matter where you install it on the bus, but what about a split bus panel?
Any help would be appreciated