The answer to 'how to install emergency electrical service' is to first assess the situation and determine if it is a true electrical emergency that requires immediate action. If so, you should shut off the main power supply to your home and then contact a licensed and qualified electrician to diagnose and repair the issue. Emergency electrical service is typically needed for situations like a complete power outage, sparking or arcing wires, or exposed live electrical components that pose a serious safety risk.
For non-emergency electrical issues, you may be able to troubleshoot and resolve the problem yourself, such as resetting a tripped circuit breaker or replacing a faulty outlet. However, for any complex or potentially dangerous electrical work, it is always best to hire a professional electrician who can safely and properly address the problem.