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Old 24-11-2020, 15:02   #1
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How to connect a relay to AWG #8 cables?

I'm in the process of rewiring my boat. Today I discovered that the cable to my Jabsco Macerator pump is way too small. According to the manual I need to use AWG #8 cables. My switch panel cannot handle that size cable.

So my thinking is to run a cable from the main busbar and use a standard mini relay to switch the pump on/off.
I'm now stuck on how to attach an AWG #8 cable to the relevant poles on a relay.

The pump uses 15A and requires a 20A fuse. To my knowledge, female spade terminals can handle up to #10 cable (6mm2). So I need some kind of socket where I can plug the relay in and can handle AWG #8 cables using ring terminals or some other method.
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Old 24-11-2020, 15:48   #2
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Re: How to connect a relay to AWG #8 cables?

The manufacturer's recommendation to use AWG 8 is based on assumed voltage drop not ampacity of the conductors.

To determine what size conductors you really need, you will need the round trip length of the circuit from the source to the pump macerator motor. For this application, I would use the 3% voltage drop tables to find the conductor size.

Now, to directly answer your question, the here is the socket for a standard Bosch type relay: https://www.delcity.net/store/Pre!Wi..._72562.h_72661

Signal B+ to terminal 85, signal B- to terminal 86; Power B+ line (in) to terminal 30, Power B+ load (out) to terminal 87.
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Old 24-11-2020, 19:20   #3
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Re: How to connect a relay to AWG #8 cables?

you could just run 8awg to a terminal bar next to the relay, and then run 10awg from the bar to relay.

IE blue sea 2502
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