Transformers mounted on roofs containing a non-propagating liquid, suitable for the purpose and having a flash point not less than degree C need not be located in an electrical equipment vault.

Busways installed vertically shall be marked as being suitable for installation.

Panelboard overcurrent protection shall be permitted to be in the primary of a transformer supplying the panelboard, provided that the panelboard rating in amps is not less than the overcurrent rating in amps multiplied by the of the primary to the secondary voltage.

Supply conductor to a motor connection box shall have an insulation temperature rating equal to or greater than that required by table , unless the motor is marked otherwise.

High-voltage installations will have permanent, legible warning notices carrying the wording  high voltage shall be placed in a conspicuous position.

Overload devices responsive to motor current shall be set to trip at not more than % of the full load current rating of the motor having a service factor of 1.15 or greater.

A transformer of the dry-core, open-ventilated-type shall be mounted so that there is an air space of not less than mm between the transformer enclosure and between a transformer enclosure and any adjacent surface.

Where an overcurrent protection device will not permit the motor to start, the rating of the overcurrent device shall be permitted to be increased to % of the motor full load current fuses rated up to 600 amps if a non-time-delay fuse is used.

Busways shall not be placed where subjected to vapours

Transformer shall be provided with a nameplate bearing the and seconday Voltage rating.