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You need this value to perform voltage drop calculations, as this is done using Ohms Law.ġ LEN is 50mA, thus 20 LEN is 1A. LEN is a way of representing how much current a device draws from the network, and every certified NMEA 2000 device has a LEN, which should be published by the manufacturer in the device documentation.
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Understanding Load Equivalency Numbers (LEN) The diagram doesn’t need to be too scale, or precise and a hand-drawn diagram will be sufficient, however, the diagram is necessary to do any voltage drop calculations when considering power implementation.Īt a minimum, the diagram must include cable lengths, power insertion location(s), LEN (Load Equivalency Numbers) of each device, and the single shield wire location that is connected to the Vessel’s RF Ground. So, how do you power your NMEA network? The first and arguably most important thing is a network diagram, which details all cables, connectors, and devices that will be on the network. Whilst this article can’t cover everything it will cover some of the fundamentals. Powering your NMEA 2000 network shouldn’t be a chore or a difficult task, but there are various things to consider during the planning stage, which will save you a lot of time when it comes to doing the installation.