Malini6702
Member
- Location
- Tampa, FL
- Occupation
- Compliance Manager
Hi All,
I've been scouring NFPA 70 and read many of the posts here related to Class 2 power supplies but haven't found a relevant post. We have a Class 2/Class II power supply connected to a control board that feeds to the main control panels in a wheelchair platform lift. The power supply provides a trickle charge to four (4) manufacturer custom 12V LiFePO4 batteries, and as such is not the main power source for the machine... it's essentially like a laptop charger.
Bottom Rail (link to a photo of the bottom rail in Dropbox)
My questions:
1. the power supply connects to a control board in a rail that hides behind an accessible cover plate. For outdoor installations the lower rail allows rain to fall through and not accumulate, and the control board is coated with silicon grease. No other electronics are located in this lower rail. The manufacturer places an IP23 rating on the entire unit. Does the enclosure need to be classified as 3R?
2. the batteries are located after the power supply (obviously) and the machine is designed to operate up to 30 times in case of power failure. The components of the battery are TUV listed, but the battery is not a Class 2 listed battery; it is made only for this manufacturer. Do the batteries need to be listed as Class 2?
I would appreciate any help on this. I'm currently arguing with a young Intertek engineer, specifically because CSA B44.1/ASME A17.5-Standard for Elevator and Escalator Electrical Equipment section 1.4 states: "This Standard does not apply to devices that are rated for connection to extra-low-voltage Class 2 supply circuits as defined in the applicable electrical code." The lift meets the requirements for ASME A18.1-Safety Standard for Platform Lifts and Stairway Chairlifts.
Thank you in advance
I've been scouring NFPA 70 and read many of the posts here related to Class 2 power supplies but haven't found a relevant post. We have a Class 2/Class II power supply connected to a control board that feeds to the main control panels in a wheelchair platform lift. The power supply provides a trickle charge to four (4) manufacturer custom 12V LiFePO4 batteries, and as such is not the main power source for the machine... it's essentially like a laptop charger.
Bottom Rail (link to a photo of the bottom rail in Dropbox)
My questions:
1. the power supply connects to a control board in a rail that hides behind an accessible cover plate. For outdoor installations the lower rail allows rain to fall through and not accumulate, and the control board is coated with silicon grease. No other electronics are located in this lower rail. The manufacturer places an IP23 rating on the entire unit. Does the enclosure need to be classified as 3R?
2. the batteries are located after the power supply (obviously) and the machine is designed to operate up to 30 times in case of power failure. The components of the battery are TUV listed, but the battery is not a Class 2 listed battery; it is made only for this manufacturer. Do the batteries need to be listed as Class 2?
I would appreciate any help on this. I'm currently arguing with a young Intertek engineer, specifically because CSA B44.1/ASME A17.5-Standard for Elevator and Escalator Electrical Equipment section 1.4 states: "This Standard does not apply to devices that are rated for connection to extra-low-voltage Class 2 supply circuits as defined in the applicable electrical code." The lift meets the requirements for ASME A18.1-Safety Standard for Platform Lifts and Stairway Chairlifts.
Thank you in advance