What do M/B and M/L mean on the panels?

M/B is a main breaker panel, with its own main breaker. M/L is a main lug panel, which has no main breaker and relies on a disconnect upstream, like the 200A disconnects feeding Apt. A and Apt. B here.

Can I change it to a single-phase service?

Yes! Edit the transformer note, meters, and panel labels in ArcSite to match the service you're installing.

Can my whole team quote from the same pricing?

Yes. An admin sets up the product library and pricing once, and every electrician on your team draws and quotes from it, so no one edits costs from the field.

Residential Electrical One Line Diagram

Template Library

A one line diagram gets the utility, the inspector, and your crew on the same page about how power reaches every panel in a house or a duplex. ArcSite's residential electrical one line diagram traces a 240/120V service from the pole transformer through two meter bases to four panels and the ground rods.

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Key Features

This residential electrical one line diagram includes:

New overhead drop from a pole-mounted transformer
240/120V 3-phase delta secondary
8,145 A of available fault current
200A 3-phase meter feeding a 200A and a 125A main breaker panel
2-gang 200A meter feeding two 200A main disconnects
200A main lug panels for Apt. A and Apt. B
Conduit and conductor callouts on every run
#6 Cu to ground rods

The two apartment feeders run Type SER aluminum while every other run is copper, so price them separately.

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Professional & accurate designs

Design tips

Key Considerations When Designing a Residential One Line Diagram

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Available fault current sets the minimum interrupting rating for every breaker downstream, so get that number from the utility before you pick panels. In ArcSite, you can label each feeder with its conduit and wire size and drop the diagram into the proposal you send your customer.

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