Reference

What size generator do you need for power tools: the running-vs-starting-watts distinction, a tool draw table, and a four-step worksheet that adds concurrent loads plus the largest motor surge. Also covers what OSHA 1926.404(f)(3) actually requires for grounding, CO-shutoff certification, and sizing the cord for the last hundred feet.

Every OSHA extension cord requirement with its exact citation: the three-wire hard-usage rule of 1926.405(a)(2)(ii)(J), GFCI protection vs the assured equipment grounding conductor program, the splice and repair restrictions, strain relief, and routing. Closes with the daily two-minute inspection routine that satisfies all of them.

The extension cord gauge chart for jobsite loads: which AWG carries which amp draw at 25, 50, 100 and 150 feet, built on cord-set ratings and a 5% voltage-drop budget you can verify from the formula shown. Covers 12/3 vs 14/3, SJTW jacket codes, OSHA's three-wire hard-usage rule, and the troubleshooting section for a cord that runs hot.

A first aid kit inspection checklist mapped to what OSHA actually requires: the continuous adequacy duty in 29 CFR 1910.151(b) and construction's weekly check in 1926.50(d)(2). Covers the pass/fail table, the eight-step procedure, inspection frequency by workplace type, expiration dates, and the record that proves the cadence happened.

A catalytic bead burns the gas and measures the heat released; an infrared sensor measures the light the gas absorbs. Catalytic needs oxygen and can be poisoned but detects hydrogen. Infrared cannot be poisoned but is blind to hydrogen. This guide covers both principles and the specification decision that follows from them.

A poisoned catalytic bead sensor does not fault, blank or warn you. It reads low, silently, in a flammable atmosphere. This guide covers the compound classes that cause it, the difference between poisoning and inhibition, why calibration cannot fix it, and the daily function check that turns a silent failure into a visible one.

Cross-sensitivity is a sensor responding to a gas it was not built to measure, and it is not a defect but a property of the sensing chemistry itself. This guide covers the mechanism, the interference patterns crews actually meet, the under-reporting direction nobody expects, and how to diagnose a suspect alarm from clean air.

ppm and %volume tell you how much gas is actually present. %LEL tells you how close the atmosphere is to igniting. Confusing the two understates a methane hazard twentyfold. This guide covers the conversion arithmetic, why each channel uses the unit it does, and how to cross-check a mixed-unit display for consistency before entry.

A 4-gas monitor shows four channels in three different units, and they are not comparable to each other. This guide reads the display field by field: the clean-air baseline, what an oxygen drop implies, why 10% LEL is not 10% gas, what the LOW, HIGH, TWA, STEL and PEAK labels mean, and which hazards the four channels cannot see at all.

A painful respirator is almost always a poorly sealed one — the same fit problems that cause discomfort create seal gaps. This guide covers the four facial contact points where pain originates, 3M 6000 vs 7800S vs Ultimate FX geometry differences, strap tension errors, headache causes, and a step-by-step fit diagnosis worked example.

Smelling chemicals through a respirator means protection has failed. Wrong cartridge type is the most common cause — a P100 filter blocks particles, not vapors. This guide covers cartridge type selection, OSHA 1910.134 service-life compliance, ESLI vs. written schedules, seal failure diagnosis, and a spray painting worked example.