Xyoo 1882, National Fire Insurers Board (NBFU) kuj tau txais cov cai tswj kev nyab xeeb thaum ntxov. Xyoo 1893, National Insurance and Electricity Association tau pib sim ua kom sib koom ua ke ntawm cov qauv hluav taws xob sib txawv thiab cov kev qhia tshwj xeeb ntawm ntau lub xeev, thiab tau npaj lub teb chaws coding standard rau hluav taws xob teeb thiab hluav taws xob kev teeb tsa rau lub tsev thaiv.
Thawj Txoj Cai Hluav Taws Xob Hauv Tebchaws (NEC) tau thov los ntawm NBFU xyoo 1897, thiab nws kuj tsis quav ntsej tus qauv ntawm cov teeb meem xim hlau. Tom qab ntawd, xyoo 1928, NEC tau hloov kho thiab hloov kho. Ib qho ntawm cov kev xav tau yog los tsim kom muaj ib qho kev qhia tshwj xeeb rau cov xim ntawm cov av xaim, uas tom qab ntawd yog xim dawb los yog ntuj grey, thiab nws kuj tau txwv tsis pub siv cov xim no rau cov hlau nyob thiab cov hlau nruab nrab.
