Electrical installations

1.1 These requirements cover the following types of transformers:

1. Air-cooled transformers and reactors for general use;
2. General purpose autotransformers;
3. Ferroresonant transformers;
4. Class 2 and Class 3 transformers (which are evaluated in accordance with Part 3);
5. Cord-connected transformers (which are evaluated in accordance with Part 2);
6. Transformers incorporating overcurrent or over-temperature protective devices, transient voltage surge protectors, or capacitors; and
7. Permanently-connected transformers.

1.2 These transformers are intended to be used in accordance with the National Electrical Code, ANSI/NFPA 70, or CSA C22.1, the Canadian Electrical Code, Part I. The Canadian Electrical Code defines low voltage as any voltage from 31 to 750 V inclusive and high voltage as any voltage above 750 V. The National Electrical Code, ANSI/NFPA 70, defines low voltage as any voltage up to 600 V, nominal. Therefore, low voltage transformers intended for use in Canada may be rated above 600 V up to 750 V. Low voltage transformers intended for use in the United States are rated up to 600 V. Where information in clauses and tables in this standard reference voltage ranges, the limit of 600 V applies in the United States, while the limit of 750 V applies in Canada.

1.3 The standard does not cover the following transformers:

1. Direct plug-in types;
2. Neon;
3. Liquid-immersed;
4. Variable voltage (Variac);
5. Low voltage landscape;
6. Swimming pool and spa:
7. Ignition;
8. High intensity lighting;
9. Toy;
10. Fluorescent lamp types;
11. Transformers for welders;
12. Distribution;
13. Transformers intended for use in the United States with a nominal primary rating of more than 600 V;
14. Transformers incorporating rectifying or waveshaping circuitry;
15. Transformers for use with radio- and television-type appliances;
16. Transformers intended for use in the United States having overvoltage taps rated over 660 V;
17. Autotransformers used in industrial control equipment, which are evaluated in accordance with the requirements of the Standard for Industrial Control Equipment, UL 508, or CSA C22.2 No. 14, Industrial Control Equipment; and
18. Other special types of transformers covered in requirements for other electrical devices or appliances.

1.4 Part 1, as well as Part 2 and Part 3, establish the characteristics, construction, operating conditions, markings, and test conditions for each type of transformer.

1.5 The requirements in this standard may be modified by requirements in an end product standard if a transformer is intended for use only as a component in other equipment.

1.1 This Standard specifies the mechanical and electrical characteristics of three-phase network distribution transformers having rated primary voltages up to 34.5 kV and kV-A ratings of 500 to 2500 Note: It is possible that transformers complying with this Standard will, if operated by a body other than an electric utility, be subject to additional requirements imposed by the electric inspection authority having jurisdiction. 1.2 This Standard applies only to three-phase distribution transformer units intended for use in a ventilated vault or enclosure below grade level.

1.1 This Standard applies to uninterruptible power supplies (UPS). The primary function of the UPS covered by this Standard is to ensure continuity of an alternating power source. The uninterruptible power supplies can also serve to improve the quality of the power source by keeping it within specified characteristics. 1.2 This Standard is applicable to movable, stationary, fixed, and built-in UPS for distribution systems up to and including 600 V ac.

The technical requirements for parallel generation are in place to ensure public and employee safety, protect the integrity of Toronto Hydro’s system, and guarantee reliable and quality service to Toronto Hydro customers. The technical requirements in this document are for the protection of Toronto Hydro's facilities, and the Generator should satisfy itself as to any requirements for the protection of its own facilities.

The guide covers the application of metal-oxide surge arresters to safeguard electric power equipment, with a nominal operating voltage 1000 V and above, against the hazards of abnormally high-voltage surges of various origins. It also provides information on the characteristics of metal-oxide surge arresters and the protection of substation equipment, distribution systems, overhead lines, and large electrical machines.

1.1 This Standard applies to single-phase and polyphase transformers of the dry type for supplying energy to power, heating, and lighting circuits and designed to be installed and used in accordance with the Canadian Electrical Code, Part I. 1.2 This Standard applies to multiwinding and autotransformers rated 72.5 kV class and less. 1.3 This Standard applies to transformers for use in nonhazardous indoor and outdoor locations.

BC Hydro provides a means for distribution-connected customers to connect a small energy source to the BC Hydro Distribution System to offset their load and participate in the Net Metering program (RS1289) or other energy procurement offers. This document contains the technical interconnection requirements for connecting small generators to BC Hydro’s Distribution System. The total generation must have an aggregate nameplate rating of 100 kW or less. DGs with generation over this limit should refer to BC Hydro Interconnection Requirements for Power Generators 35 kV and Below.

This standard covers the safety and performance of distributed energy resource systems. These systems may be comprised of distributed energy sources such as photovoltaic arrays or wind turbines in homogenous or hybrid configurations, energy storage systems, grid interface equipment and related equipment to accomplish functionality of the distributed energy system.

This standard covers performance requirements for emergency and standby power systems providing an alternate source of electrical power in buildings and facilities in the event that the normal electrical power source fails. Systems include power sources, transfer equipment, controls, supervisory equipment, and accessory equipment needed to supply electrical power to the selected circuits.