CSLB B GENERAL QUESTIONS AND ANSWERS RATED A

PTICH rise/span what size of a circuit breaker can be installed on a line with 7 outlets 14 AWG wire? 15 amp; according to code, the conductor ampacity rating for a 14 gauge wire is 15 amps. for 12 gauges wire is 20 amps. the number of outlets does not determine the size of circuit breaker. how many roof squares are in the roof measuring 45' by 50'? 22.5; (45x50) / 100 (roofing squares made of 10'x10'). total drop for a 120' pipe with a 2% slope? 2'5" = 120x2%=2.4 how many 4"x4" tiles do you need to tile 30"x60" shower floor and three walls 60" high with 1/4" grout? allow 10% for waste. step 1: calculate total area: shower pan: 30"x60" = 1800 square inches. two small walls 2 @( 30"x60")= 3600 square inches. back wall= 60"x60"=3600 total= 9000 square inches. step 2: calculate tile coverage including grout. 4 1/4" x4 1/4" = 18.0625 step 3: divide 9000/18.0625 = 499 tiles step 4: add 10% 499x.10= 50 tiles 549the load area of skylight is equal to inside dimension of a deck mounted skylight; inside area of the skylight curb; rough opening in the roof. how many kWh will be consumed by a 500w lightbulb running for 3 hours? 1.5 kWh. step one solve for total watt-hours= 500w x 3=1500 step 2 convert: 1 kilowatt= 1000 watt 1500/1000=1.5 how many board feet do you need for a wall 20' long with 2x4 studs 8 feet high spaced at 16 o.c.? Step 1: convert wall length and stud height into inches, by multiplying length by 12. wall: 20'x12=240" stud: 8'x12=96" step 2: divide wall length by the spacing of the studs 240"/16"= 15 studs + 1 starter= 16 studs total step 3: figure out board feet board feet= thickness in inches x width in inches x length in inches / 144. 2"x4"x96"/144=5.33 board feet per stud. step 4: multiply board feet by number of studs 5.33x16=85.28 board feet. which of the following is a low slope roof system modified bitumen; can be applied to a slope no less than 1/4:12