Wuxuan Emergency Management Bureau. Wuxuan Climbing Permit, also known as Work Permit for Installation, Maintenance and Demolition at Height and Work Permit for Aerial Work, is a special work permit that must be obtained by personnel engaged in climbing erection or installation, maintenance and demolition at height. Issued by Wuxuan Emergency Management Bureau, the certificate is first tried for 3 years and renewed once every 6 years. Special operations personnel must undergo systematic safety technical training and pass the examination, and only after obtaining the special operation certificate can they work at their posts.