I am also concerned that the electrical wires have been stapled down with metal staples, can the heat burn through the wire insulation and short out the wires? Last year I was in the attic on a hot day and the wires were almost too hot to touch. I've installed ventilation this year and I want to find a target temp, it's common for the temperature outside to be in the 90s where I live.
No. Wires are rated for the heat.
The lowest temperature that can due damage is 350 degrees with foam insulation. You have to go up to 400 to take out the wires. At those temperatures, the house is on fire.
Don't worry about the wires. The wire coating will sustain temps up in the 400 degree range. I recently installed (2) powered roof vent fans on a roof for a customer. These fans actually suck out the hot attic air and bring in cooler air from the soffit vents. If you just installed gravity type roof vents you may want to add a power attic fan. Just remember you need a source for air to come into the attic. Ridge vent is almost worthless as it does constrict the air flow - I am not a big fan of Ridge vent. Hip roofs are harder to vent as there are no gables which means most of the hot attic air is trapped on the hip sides as there is not even a place for ridge vent except for a small portion of the top ridge board.
