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The Information on this Page Applies to:
We're working to bring you a better online experience with the Customer Connection Guide. In the meantime,
please use this PDF version of the current Customer Connection Guide (May 2017 version).
Please take a moment to familiarize yourself with the newest edition of the
Customer Connection Guide (effective May 1, 2019).
NOTE: The customer owns and maintains all transformer bases, switching cubicle bases, ground grids, primary ducts, and all secondary works on private property. Customer owns and maintains primary cable in MFU sites.
NOTE: EDTI owns and maintains all transformers, switching cubicles, primary cable (except for multi-family sites), and revenue metering equipment.
Property line for multi-family sites, transformer for all other installations.
As a customer, you or your contractors are responsible for:
Please note that all equipment and conductor locations on the drawing are to be dimensioned from the building and property lines and given real-world coordinates. Curb lines may also be included.
EDTI Customer Engineering Services will review and accept drawings and the scope of work.
The following horizontal clearances to other utilities from underground service lines and equipment, including padmount transformers, switching cubicles, guardrails, and ground grids, must be maintained:
Conduit size requirements for primary (high-voltage) cables depend on cable size and voltage. See
Drawing 29 for primary voltage and
Table 4 for primary cable, duct, and pull box standards.
When a transformer or switching cubicle is required on the customer's property, the customer must provide the precast concrete bases with an appropriate ground grid and guardrails. Please see the
Ground Grids and Guardrails for Padmounted Equipment Section (2.19).
2 × 10-in. pressure-treated lumber is required under all switching cubicle bases and 1-phase transformer bases. See
This section applies to multiple-metered residential service connections where 1-phase padmount transformers and service pedestals are required on the customer's property. While other information on padmount transformer installations found elsewhere in this guide also applies, the following information is specific to multi-family developments and mobile home parks.
Your next steps are to ensure the metering is installed correctly and to choose a retailer.
Installation of precast concrete 4-way pull box
Typical underground residential service installation on property
Typical transformer alcove layout
Installation of precast concrete base for 4-way 3 phase 15kV switching cubicle (all variants)
Installation of precast concrete base for 4-way 3 phase 25kV switching cubicle (all variants)
Installation of precast concrete base for 4-way 15kV single phase 200 amp dead front switching cubicle
Installation of precast concrete base for 4-way 25kV single phase 200 amp dead front switching cubicle
Installation of precast concrete base for single phase transformers
Installation of precast concrete base for three phase transformers
Ground grid requirements for 15kV & 25kV switching cubicles and three phase transformers next to each other
Guard rail construction details
Right-of-Way requirement for 1-phase switching cubicle, 1-phase transformer or 3-phase transformer
Right-of-Way requirement for 1-phase switching cubicle, 1-phase transformer or 3-phase transformer with 2.0 m gas Right-of-Way
Right-of-Way requirement for 3-phase switching cubicle
Right-of-Way requirement for 3-phase switching cubicle with 2.0 m gas
EPCOR 5kV, 15kV, 25kV and downtown engineering distribution areas
Customer's / EDTI's responsibilities
Padmount transformer service
Maximum horsepower of motors permitted
Main switch or breaker minimum interrupting capacity
Part 1: Primary cable, duct, and pull box standardsPart 2: Primary cable, duct, and pull box standards examples
Padmount equipment – maximum setback distances
Residential and multi-family underground services – Acceptable conductors