Re: Panelboard Location
I will venture a guess that the drain was added after the electrical equipment was installed.
Since you will be the one "touching" or better yet modifying this electrical instalation, you would be responsible to meet current codes.
If it were me working on this equipment, I wouldn't want to have the working space comprimised by a drain pipe, possibly metallic.
I don't have the NEC handy right now, but the Chicago Electrical Code, which closely emulates the NEC, says:
PART B. 600 VOLTS, NOMINAL, OR LESS
18-27-110.26. Spaces About Electrical Equipment.
Sufficient access and working space shall be provided and maintained about all electric equipment to permit ready and safe operation
and maintenance of such equipment.
(a) Working Space. Working space for equipment operating, at 600 volts, nominal, or less to ground shall comply with the
dimensions of (1), (2), and (3) of this subsection or as required or permitted elsewhere in this chapter.
(1) Depth of Working Space. The depth of the working space in the direction of access to live parts shall not be less than 3 ft
(914 mm). Where the working space is between adjacent equipment the distance shall not be less than 4 ft (1.22 m). Distances shall
be measured from the live parts if such are exposed or from the enclosure front or opening if such are enclosed.
Exception No. 1: Working space shall not be required in back or sides of assemblies, such as dead-front switchboards or motor
control centers, where verified by the manufacturer that there are no renewable or adjustable parts, such as fuses or switches, on the
back or sides and where all connections are accessible from locations other than the back or sides. Where rear access is required to
work on de-energized parts on the back of enclosed equipment, a minimum working space of 3 feet horizontally shall be provided.
Exception No. 2: By special permission, smaller spaces shall be permitted where all uninsulated parts are at a voltage no greater
than 30 volts rms, 42 volts peak, or 60 volts dc.
(2) Width of Working Space. The width of the working space in front of the electric equipment shall be the width of the
equipment or 30 in. (762 mm), whichever is greater. In all cases, the work space shall permit at least 90 degree opening of equipment
doors or hinged panes.
(3) Height of Working Space. The work space shall be clear and extend from the grade, floor, or platform to the height required
by Section 18-27-110.26(e). Within the height requirements of this section, other equipment associated with the electrical installation
located above or below the electrical equipment shall be permitted to extend not more than 6 in. (153 mm) beyond the front of the
electrical equipment.