EH rated means Electrical Hazard under ASTM F2413: the boot's sole and heel withstand 18,000 volts for a minute, dry, as secondary protection against accidental contact. This guide covers the test behind the letters, the wet-conditions fine print, EH vs dielectric vs SD vs CD, the label line, and a worked apprentice boot spec.
Electrical glove classes run from Class 00 at 500 volts to Class 4 at 36,000 — built to ASTM D120 and policed by OSHA 1910.137's 6-month retest clock, daily air test, and leather-protector rule. This guide decodes the voltage table, the label colors, the "insulated" naming trap, the defects that condemn a glove, and a worked 480 V spec.
OSHA has no cold-work standard — cold stress is enforced through the General Duty Clause and judged against OSHA's own guidance. This reference maps the four recognized conditions from hypothermia to chilblains, the wind-chill planning triggers, the employer control set, and the layered PPE kit, with a worked crew-winterization example.
OSHA fixed ladder requirements come from two standards: 1910.23 sets the design dimensions — rung spacing, clearances, the 42-inch rail extension — and 1910.28(b)(9) sets the fall-protection timeline that ends the ladder cage era on November 18, 2036. This guide maps every date, every dimension, and a worked 30-foot retrofit example.
Smoke detectors last 10 years from their manufacture date — not the day you installed them — under NFPA 72, and CO alarms enforce their own end-of-life clock under UL 2034. This guide shows how to read the date code on the back of the alarm, decode low-battery vs end-of-life chirps by brand, and walks a full replacement example.
OSHA's noise rule runs on two numbers: a 90 dBA permissible exposure limit and an 85 dBA action level that triggers the full hearing conservation program. This guide walks Table G-16's time limits, the OSHA-vs-NIOSH exchange-rate gap, real-world NRR derating, and a worked compliance example for a 92 dBA fabrication shop.
The numbers on a fire extinguisher label are tested capacity, not size: each 1-A equals about 1.25 gallons of water-equivalent power and the B number is square feet of liquid fire a novice can put out. This guide decodes 2A:10BC, explains the UL 711 tests behind the numbers, and works room-by-room sizing with NFPA 10 and OSHA rules.
CO alarm laws are a state-by-state patchwork: some states cover every home, others trigger only at new construction, sale, or rental, and coverage often hinges on fuel appliances or an attached garage. This guide maps the NCSL compilation into one table, explains UL 2034 and IRC R315, and walks a sale-state compliance example.
