Guide to the Canadian Electrical Code, Part 1[i], 26th Edition– A Road Map: Section 70 & Section 72

September 11, 2026

by William (Bill) Burr^[i]

Section 70 – Factory-built relocatable and non-relocatable structures, and Section 72 – Mobile home and recreational vehicle parks

The Code is a comprehensive document. Sometimes it can seem quite daunting to find the information you need quickly. This series of articles provides a guide to help users find their way through this critical document. These articles do not intend to replace the notes in Appendix B or the explanations of individual requirements contained in the CEC Handbook* but hopefully provide help to navigate the Code.

Section 70 — Electrical requirements for factory-built relocatable structures and non-relocatable structures – 26th Edition

 (The 26th Edition of the CE-C, Part I, (C22.1-24) * is available from CSA Group. This discussion of Sections 70 and 72 are based on that edition.)

Rule 70-000 notes that this is a supplementary or amendatory section of the code and applies to the electrical installation of factory-built, relocatable, and non-relocatable structures including mobile homes, mobile commercial and industrial structures, factory-built residential housing, and factory-built commercial and industrial structures. These Rules do not apply to recreational vehicles covered by the CSA Z240 RV Series.

Section 70 is divided into 2 parts – Relocatable structures and non-relocatable structures.

Relocatable structures

Rules 70-100 to 70-130 apply to factory-built relocatable structures that are towable on their own chassis and include mobile homes and mobile commercial and industrial structures.

Rule 70-100 requires that all electrical equipment in these structures be suitable for the application and comply with the standards listed in Appendix A.

Rules 70-102 and 70-104 provide for the method of connection of homes and structures to the supply circuit. Subrule 2) of Rule 70-102 requires that mobile homes only be connected directly to an overhead or underground supply unless special permission is obtained to use a different method.

Rule 70-106 provides for the method of connection of communication service for homes and structures.

Rules 70-108 to 70-112 provide for the method of connection for a power supply cord or cord set, disconnecting means, main overcurrent protection, and location of service or distribution equipment for mobile homes and structures. Where a suitable grounding-type attachment plug is used in an application covered by Section 8, the plug shall have an ampere rating not less than that of the insulated service conductor ampacity required in Section 8.

Rules 70-114 to 70-124 outline general wiring methods for homes and structures and specifically for swing-out and expandable room sections and multiple-section mobile units, including branch circuits, receptacles, switches, luminaires, and ventilating fans.

Rule 70-126 provides requirements for bonding and bonding to ground of mobile homes and structures in accordance with Section 10.

Rule 70-128 requires that units connected to the main power supply be marked in accordance with Rule 2-100, and, for multiple-section mobile homes or structures:

• each section be suitably, and permanently marked to identify the other sections to be used, and
• instructions be provided to indicate the interconnections necessary to complete the installation.

Rule 70-130 specifies the tests and procedures that the manufacturer must conduct on complete assemblies at the factory and includes:

• continuity testing of all circuits including grounding or bonding circuits,
• insulation resistance testing between live parts and ground at the completion of a 1-minute application of a 500 V dc test voltage, or
• an ac dielectric strength test, with an ac voltage of 900 V applied for 1 min (or 1080 V for 1 s) between all live parts and non-current-carrying metal parts without breakdown occurring.

Non-relocatable Structures

Rules 70-200 to 70-204 apply to general wiring methods; connection to overhead and underground supply; and service and distribution equipment of factory-built non-relocatable houses and structures, and include that Rules 70-100, 70-112, 70-114, 70-118, and 70-122 to 70-130 also apply to non-relocatable structures.

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Section 72 — Mobile home and recreational vehicle parks – 26th Edition

Rule 72-000 notes that this is a supplementary or amendatory section of the code and applies to the services and distribution facilities for mobile homes and recreational vehicle parks.

Rule 72-002 provides Special terminology for this section as follows:

Recreational vehicle lot – a designated area of a recreational vehicle park intended to accommodate one or more recreational vehicle stands, recreational vehicle supply equipment, surrounding natural features and associated recreational amenities,

Recreational vehicle lot supply equipment – electrical equipment located at a recreational vehicle lot for the purpose of supplying electrical power to one or more recreational vehicles, and

Recreational vehicle stand – that area of a recreational vehicle lot dedicated for the placement of a recreational vehicle.

Rule 72-100 requires that each mobile home and recreational vehicle must be provided with service equipment in accordance with Section 6.

Rule 72-102 outlines the calculated load for various service and feeder arrangements and requires that:

• The calculated load for the service or feeder supplying a mobile home park is based on the requirements of Rule 8-200 with respect to the service or feeder supplying an individual mobile home, and Rule 8-202 with respect to the service or feeder supplying more than one mobile home.
• The calculated load for the service or feeder supplying a recreational vehicle lot is determined by applying 12,000 watts for each 6-50R receptacle, 3600 watts for each 5-30R or each TT-30R receptacle, 2400 watts for each 5-20R receptacle, 1800 watts for each 5-15R receptacle, and by adding the watt rating of all other loads serving the lot as calculated by other sections of the code.
• For the purpose of the above, each duplex receptacle supplied from a multi-wire branch circuit is counted as two receptacles, where receptacles of different ratings are installed on one lot; the receptacle having the highest ampere rating serves as a basis for the calculation, and where the recreational vehicle lot supply equipment is in a location that can serve more than one recreational vehicle lot, the calculated load is based on the receptacle having the highest ampere rating for each lot served.
• For the purposes of calculating the service or feeder calculated load, the calculated load of a recreational vehicle lot used exclusively for tenting purposes is 600 watts for each 5-15R or 5-20R receptacle supplying such lots.
• The calculated load for the service or feeder supplying a recreational vehicle park, or portion thereof, is
  • the sum of the receptacle loads of recreational vehicle lots as determined above and as calculated in accordance with Table XY,
  • the loads for recreational vehicle lots used exclusively for tenting purposes in accordance with Subrule 4), and
  • all other loads as calculated by other sections of the code.

Rule 72-104 requires that the branch circuit for each receptacle for a recreational vehicle lot must be preceded by an individual overcurrent device not exceeding the rating of the receptacle involved and by a suitable accessible disconnecting means.

Rule 72-106 requires that the circuit for each mobile home lot be preceded by a suitable accessible disconnecting means, an individual overcurrent device not exceeding the rating of the equipment involved, and within enclosures of weatherproof construction if installed outdoors.

Rule 72-108 specifies the connection facilities for recreational vehicles and mobile homes and outlines:

• the types of 15A, 20A, 30A, and 50A receptacles required where installed on recreational vehicle lots,
• the requirement for a permanent connection to a mobile home, except that for a home with a 50A rated overcurrent protection, a 50 A, 125/250 V, 3-pole, 4-wire Type 14-50R receptacle may be permitted (under Rule 2-030),
• all receptacles must be mounted in a horizontal plane, or so that the u-ground slot is uppermost, and
• 15A and 20A receptacles must be protected by a Class A type ground fault circuit interrupter.

Rule 72-110 states that power supply cords may be permitted for the connection of:

• recreational vehicles, only where the cords are not subject to mechanical damage; and
• mobile homes only when the lot is equipped with a 50 A, 3-pole, 4-wire Type 14-50R receptacle (permitted under Rule 2-030).

Rule 72-112 requires that when recreational vehicle lot supply equipment is provided, the equipment must be located on the left side of the parked vehicle, on a line that is 1.5 m to 2.1 m from the left edge (driver’s side) of the recreational vehicle stand, and at a point

• not more than 4.5 m from the rear of the recreational vehicle stand where the stand is a back-in lot; or the front of the recreational vehicle stand where the stand is a drive-in lot; or
• between 4.9 m forward of the rear of the stand and the centreline between the two roads that give access to and egress from the stand where the stand is a pull-through lot.

In addition, recreational vehicle lot supply equipment must be located not less than 600 mm or more than 1.2 m above the ground.

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[i] William (Bill) Burr is an associate member of the Canadian Electrical Code, Part 1, Technical Committee and formerly Chair of the Canadian Advisory Council on Electrical Safety (CACES), Chief Electrical and Elevator Inspector for the Province of BC & the Northwest Territories, Director of Electrical and Gas Standards Development and Director of Conformity Assessment at CSA Group. Bill can be reached at Burr and Associates Consulting billburr@gmail.com..

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[i] Source: CSA C22.1:24, Canadian Electrical Code, Part 1 – Safety Standard for Electrical Installations. © 2024 Canadian Standards Association. Please visit store.csagroup.org. With the permission of CSA Group, material is reproduced from CSA Group standard CSA C22.1:24, Canadian Electrical Code, Part 1 – Safety Standard for Electrical Installations. This material is not the complete and official position of CSA Group on the referenced subject, which is represented solely by the Standard in its entirety. While use of the material has been authorized, CSA Group is not responsible for the manner in which the data are presented, nor for any representations and interpretations. No further reproduction is permitted. For more information or to purchase standard(s) from CSA Group, please visit store.csagroup.org or call 1-800-463-6727.