The details of layout and construction of electrical houses (E House) will be controlled by local building code and electrical code regulations. Requirements for an E House relate to fire safety and electrical hazards. An E House is usually required to be secured from access by unauthorized persons; these rules are especially strict where equipment within the room has exposed live terminals.
Regulations may require multiple means of exit from a room where the power rating of circuits exceeds some threshold, to allow for quick exit in an emergency. Rooms containing oil-filled equipment may be required to have fire-resistant construction or active fire suppression equipment in the room and may be designated as an electrical vault. Since power distribution often requires large numbers of electrical cables, special measures for fire resistance of cables and cable trays may be also specified by regulations. Whether or not the building is manned or unmanned and the area classification the E House will be placed into plays a role in the regulation requirements as well.
In some E Houses, rooms may be prepared that have ventilation and other measures to prevent an explosion hazard that would otherwise exist with electrical equipment in hazardous areas. For large installations, it may be less costly overall to use a special room than to install a large number of devices that are resistant to the hazardous conditions. Similarly, in wet or corrosive environments, electrical equipment may be separated in a room that can be protected from the atmospheric conditions.
The fabrication of an E House can involve multiple parties / vendors during the fabrication of the base frame / skid (which could be larger than the house itself to accommodate additional equipment outside of the E House, to the uprights and perlins, Building Panels and Roof installation, Handrails, Stairs and Safety Gates, installation of cable trays, wiring, lighting, fire suppression systems, HVAC installation, electrical equipment installation and more.
Building code and electrical code regulations will dictate minimal working space around equipment to allow safe access during maintenance. Practical design of an electrical room will consider layout of the initial equipment and allow for additions over the life of the facility.
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