Every electrical panel has a limited capacity. If it's a 100-amperage panel, it can only supply 100 amps and no more. When your electricity consumption requirements exceed the capacity of the panel, you will require a heavy up. Here are the top five signs your home may need an electrical heavy-up.
You still have an electrical panel with fuses.
When you turn on appliances, the lights flicker (especially the ones that consume more power).
To the touch, the electrical panel is extremely hot.
Noise is coming from the outlets.
You haven't replaced your panels in over 25 years.