Terminating large cables

JumbleDuck said:
At 0.193 ohms/km (BS6346 Cables|Technical Reference) that would be a total voltage drop of 0.6V. Doesn't seem toooo bad.
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Normal acceptable voltage drop is 3-4%, that's 5%. The thruster manufacturers recommendation is 2 x 95mm, with 120mm as a minimum.

I know it doesn't sound much of a difference, but a 6hp thruster inrush can pull the voltage down to circa 10.6v with even the correct cables.
 
Another vote for the hydraulic type. Just gutted that they have come down on price significantly since I bought mine.

As noted above, you may need to start with the matching size die then go down one. I aim to do that just tight enough not to get tabs squeezed out. In a QC production environment, the lugs and tools would be perfectly size matched and calibrated for consistent results.

Also the ratchet cable cutters are good for a quick square cut with minimal effort.
 
PaulRainbow said:
I've seen other comments about loose crimps, not sure if some of the dies are a bit iffy or if people are using terminals that vary a bit in size. As you say, if it isn't well crimped, come down a size on the dies (y)
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The wall thickness of the lug/terminal makes a big difference too. The cheaper terminals you find in wholesalers and on the web often have thinner walls than decent quality components.
 
Keith-i said:
The wall thickness of the lug/terminal makes a big difference too. The cheaper terminals you find in wholesalers and on the web often have thinner walls than decent quality components.
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This is true, which is why i always say buy decent terminals. I only buy from a local UK supplier and i've never had a loose terminal or had to use a smaller sized die.
 
pvb said:
Except that the thruster's current isn't 200A, it's nominally 530A, which is why bigger cables are needed.
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That was my bad, the other thread was discussing two different installations (this is why it's better if people start their own threads), you are correct that the one requiring 2 x 95mm cables is nominally rated at 530a

The voltage drop is therefore 13.3% (1.59 volts) with a single 95mm cable.That's not even close to acceptable.
 
PaulRainbow said:
That was my bad, the other thread was discussing two different installations (this is why it's better if people start their own threads), you are correct that the one requiring 2 x 95mm cables is nominally rated at 530a

The voltage drop is therefore 13.3% (1.59 volts) with a single 95mm cable.That's not even close to acceptable.
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I see your point. Thanks.
 
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