sec.239Other explosion-protected electrical plant

### sec.239 Other explosion-protected electrical plant This section applies to explosion-protected electrical plant supplied with electricity by a trailing cable, other than plant— mentioned in sections 233 to 238 ; or having explosion protection category Ex ia; or operated in a NERZ. The plant must be fitted with at least 1 automatic methane detector to detect the general body concentration of methane around the plant. The detector must automatically trip the electricity supply to the plant when the concentration exceeds 2%. This section does not apply to plant that is being operated in a location inspected periodically by a person using a portable methane detector. In this section— periodically , for inspecting plant in a location in an ERZ1, means at least twice during a shift at approximately evenly spaced intervals. (sec.239-ssec.1) This section applies to explosion-protected electrical plant supplied with electricity by a trailing cable, other than plant— mentioned in sections 233 to 238 ; or having explosion protection category Ex ia; or operated in a NERZ. (sec.239-ssec.2) The plant must be fitted with at least 1 automatic methane detector to detect the general body concentration of methane around the plant. (sec.239-ssec.3) The detector must automatically trip the electricity supply to the plant when the concentration exceeds 2%. (sec.239-ssec.4) This section does not apply to plant that is being operated in a location inspected periodically by a person using a portable methane detector. (sec.239-ssec.5) In this section— periodically , for inspecting plant in a location in an ERZ1, means at least twice during a shift at approximately evenly spaced intervals. - (a) mentioned in sections 233 to 238 ; or - (b) having explosion protection category Ex ia; or - (c) operated in a NERZ.