(2) 3-1/2" pipe 15 #/ft x 8 ft 	= 240 #
(2)wire	1.5 #/ft x 8 ft x 4.5 wires	= 108 #
total				= 384#

LRFD 1.2Dead Load	418# gravity force per space between supports

3.5" x 96" = 336 sq in x .66 (round factor) 221.8 sq in or 1. 45 sq ft * 2 conduits = 3.08 sf
1.6 W  = 1.6 x 42 psf = 67.2 psf;	3.08 x 67.2psf = 	207 # wind force between supports 

30" span of 12 gauge HS-Style unistrut will require 4 anchors per section
Each anchor must hold 384# / 4 = 96# in shear

Use a 30” to 36” length of 12 gauge HS-Style unistrut using 4 anchors per section with a maximum spacing of 8 ft between unistrut supports. 4 - #14 Stainless-steel self taping screw.