Service component
Service mast
What the service mast does and how it can affect a residential service upgrade.
Short answer
The service mast supports and routes an overhead electrical service at the building. In an upgrade, height, attachment, clearances and condition can bring utility and permit requirements into the project.
Key takeaways
01The service is a connected path, not one box.
02Ownership boundaries vary by utility and jurisdiction.
03A quote should identify whether this component is inspected, reused, modified or replaced.
Role in the service path
This component supports and routes an overhead electrical service at the building. Its condition and rating need to be understood in relation to upstream and downstream equipment.
Upgrade impact
height, attachment, clearances and condition can bring utility and permit requirements into the project. The contractor and utility determine the applicable responsibilities.
Quote question
Ask the contractor to state whether the service mast is included, excluded, subject to utility review or expected to remain.
Decision table
What the evidence changes
- Primary role
- supports and routes an overhead electrical service at the building
- Upgrade question
- height, attachment, clearances and condition can bring utility and permit requirements into the project
- Responsibility
- Confirm for the serving utility and jurisdiction
Typical project sequence
From question to documented work
- 01Identify
- 02Assess rating and condition
- 03Confirm ownership
- 04Define scope
- 05Inspect and document
Sequence and responsibilities vary by jurisdiction, utility and scope.
Evidence
Sources and verification
Published by the 200AmpPanel.ca Research Team, a HAUSE specialist property. Updated 2026-08-31.
Questions
Frequently asked
Who owns the service mast?
Ownership and maintenance boundaries differ. Confirm with the contractor and serving utility for the address.
What should I do next?
Use the Capacity Check to organize what you know, then have a qualified electrical contractor complete the assessment required for the property and jurisdiction.
Your next step
Bring the right facts to the first conversation.
Record the visible service clue, planned equipment and any relevant documents. The free brief organizes your questions; a qualified person verifies capacity and scope.