The enclosure shall be constructed so that, with all field-installed wiring connected to the product, a minimum of 1/4 inch (6.4 mm) spacing is provided between all Class 2, Class 3, and power-limited fire protection circuit conductors and all electric light, power, Class 1 and nonpowerlimited fire protection circuit conductors. Compliance with this requirement is achieved by specific wire routing configurations that are detailed in the installation document. When a wire routing scheme does not maintain a separation of 1/4 inch (6.4 mm), barriers shall be used to provide separation