(1) A manufacturer of units may make applications for approval of typical equipment and installations prior to construction, which may be referenced on subsequent plans. The following letters will be used to designate typical systems: E, M, P.

(2) The following electrical specifications must be set forth in the plan:

(a) type and size of feeder assembly;

(b) voltage and amperage of branch circuit panelboard;

(c) branch circuit identification, amperage or overcurrent protection device wire size and type;

(d) voltage and amperage of fixed appliances;

(e) calculations according to NFPA 70.

(3) The plan may be drawn to scale or schematic. It must set forth the following mechanical information:

(a) description of all materials, appliances, fittings, pipe, tubing, vents and ducts;

(b) BTUH input rating of all fuel burning appliances;

(c) size of openings for combustion air, except where combustible air is an integral part of an approved appliance;

(d) size, length, type and location of vents and vent connectors;

(e) type, minimum dimension and gauge of air ducts;

(f) minimum free area and location of circulating air supply inlet;

(g) minimum free area and location of all air openings.

(4) The plan may be drawn to scale or schematic. It must set forth the following plumbing specifications:

(a) description of all materials, fixtures, fittings, pipe tubing, shower stalls and walls;

(b) diameter and type of pipe and tubing, and length of all trap arms;

(c) size and type of fittings;

(d) grade of drainage piping;

(e) method of securing all piping.