Maintenance of gaps for 230 kV and 400 kV lines August 4, 2017 | Latin America Tenders Competitive bids are invited for the maintenance of line gaps of 230 kV (38.90 km) and 400 kV (11.10 km) transmission lines in the field of ZT Culiacán. This content is available to only paying subscribers. Username or E-mail Password Remember Me Forgot Password