How many CFM do I need for an electrical room?

How many CFM do I need for an electrical room?

We noticed ASHRAE has a minimum cfm requirements for electrical equipment rooms (0.06 cfms/sf), however it was our understanding these rooms are exempt from calculations as this credit establishes minimum performance for occupant comfort and wellbeing.

Do mechanical rooms require ventilation?

All mechanical rooms must be mechanically ventilated to maintain room space conditions as indicated in ASHRAE 62, ASHRAE 15, and Table 5-1 of this chapter.

Do electrical rooms require cooling?

Cooling an electrical room is vital to maintaining a safe and optimal working environment for this type of equipment. When an electrical room overheats, it can be a fire hazard, short out the electrical system, or worse.

Why is ventilation generally required for indoor transformers?

Substation ventilation is generally required to dissipate the heat produced by transformers and other equipment, and to allow drying after particularly wet or humid periods.

How do I calculate room ventilation?

Derives the ventilation rate from the volume of the space (in cubic feet) to be ventilated multiplied by the number of total air changes in one hour. Example: For an auditorium, the suggested air change rate is 4 to 15 air changes per hour. An auditorium is 80′ x 90 ‘ with 20’ ceiling or 144,000 cu. ft.

What temperature should an electrical room be?

Keeping the ambient of the electrical room below 86 F avoids de-rating conductors in the electrical room. Most electrical equipment is rated to 104 F; 86 F for the room generally keeps electrical equipment from exceeding this temperature.

How big should an electrical room be?

The width should be equal to the width of the equipment and no less than 30 in., while allowing for opening any doors or hinged panels to a full 90 deg. The height should be 6 ft 6 in. from the floor, or the height of the equipment if greater than 6 ft 6 in.

Can dry-type transformers be installed without an enclosure?

To place a dry-type transformer outdoors, you must install it in a weatherproof enclosure. If the transformer exceeds 112.5 kVA, you can’t locate it within 1 foot of combustible materials of buildings unless the transformer has Class 155 insulation or higher and is completely enclosed except for ventilation openings.

How are transformers installed?

Provide proper clearance for cable and avoid installing them near blades or coils. Follow minimum wire bending space clearances at terminals for conductors per NEC. If required, follow NEMA standards for transformer sound control depending upon the kVA rating of a unit. Ground, ground and don’t forget to ground.