A contractor discovers that the existing electrical service is only 100 amps, but the new addition requires 150 amp total service. According to Michigan electrical requirements, what action is required?
Correct Answer
C) Upgrade the main service to 200 amps minimum
Michigan electrical code requires service upgrades to meet current minimum standards, which is typically 200 amps for residential service when upgrades are necessary.
Why This Is the Correct Answer
When a residential electrical service upgrade is required in Michigan, the code mandates that the service be brought up to current minimum standards — which is 200 amps for residential service. You cannot upgrade to exactly 150 amps; the code requires a jump to the next standard service size, which is 200 amps. This ensures the home meets current standards and has capacity for future loads.
Why the Other Options Are Wrong
Option A: Use load management devices to stay within 100 amps
Load management devices can reduce peak demand but do not eliminate the code requirement to upgrade service when the calculated load exceeds the existing capacity. You cannot use demand management as a workaround to avoid a required service upgrade.
Option B: Install a sub-panel for the addition only
Installing a sub-panel for the addition only does not resolve the underlying issue: the main service (100 amps) is insufficient for the total calculated load (150 amps). The sub-panel would still draw from an undersized main service, creating a code violation and safety hazard.
Option D: Install separate meter for the addition
Installing a separate meter for the addition creates two separate electrical services, which may be allowed in some commercial scenarios but is not the standard or required solution for residential additions in Michigan. It also adds ongoing cost and complexity without addressing code compliance.
Memory Technique
In Michigan residential: 100A → next upgrade is 200A. There is no 150A residential standard service. Think of it as a binary choice once you exceed 100 amps: you go straight to 200. 'Skip 150, go to 200.'
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