Transformer Room Requirements

Figure 1 depicts a conventional electrical room layout where spacing is consistent with basic nec clearance requirements.

Transformer room requirements.

Search for your solution. Many specifications list a number of transformer standards and make a statement in the specifications that the transformers must meet these standards. Some definitions and requirements of these standards such as csa c88 m90 ieee c57 12 00 and iec 60076 are different. This requirement holds even if components are protected by safety enclosures or screens.

Actual plinth size is subjected to the transformer rating and type. This step will help you to avoid unnecessary and costly design changes or delays that may result if these requirements are not incorpo rated into your final building design. For example look at the requirements for dry type transformers. Transformer room with fire resistant construction or must be installed in a transformer vault.

Transformers with class b insulation 80 c temperature rise or class h insulation 150 c temperature rise need not be installed in a transformer vault provided they are separated from combustible material. Conventional panelboard transformer room layout. The nec also requires 3 to 4 1m to 1 3m of aisle space between live electrical components of 600 volts or less depending on whether live components are on one or both sides of the aisle. Dry type transformers installed indoors.

Containment pan curbing room containment e g door sill 2 the transformer be filled with a listed less flammable insulating liquid with a minimum of 300 c fire point. 3 the installation complies with all restrictions provided for in the listing of the liquid. Components are mounted individually on the wall. Typical transformer vault space require ments depend on the number of transformers required to supply electricity to your build ing.

Floor space dedicated for this conventional layout employing panelboards and a transformer shown is 90 75 ft2 8 43 m2. From combustible material unless separated by a fire resistant heat insulated barrier. 4 4 2 the minimum dimensions of the transformer plinth should be 1 8m long x 1 3m wide and level with finished floor level. If these are not over 112 kva they need a separation at least 12 in.

The following have different explanations in these standards. Other magnetics may have lower or higher ambient ratings depending on the design and application. Your transformer vault requirements.