Power distribution board

Submitted: Wednesday, Apr 26, 2006 at 12:59
ThreadID: 33259 Views:1392 Replies:4 FollowUps:3
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Hello all,

I am building a remote distribution board in my canopy.

Q] The aluminium busbars are 5mmX20mm & are threaded to take the 6mm take-offs.Should I apply threadlock for the take-offs or not?[Bear in mind there could be lots of current involved!]



Thanks.....eng
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Reply By: Kiwi Kia - Wednesday, Apr 26, 2006 at 13:54

Wednesday, Apr 26, 2006 at 13:54
No, do not use any thread lock / loctite etc. If you want to be sure of avoiding a connection coming loose with vibration then use a 2nd nut as a locking nut on each stud.

AnswerID: 169081

Reply By: Member - Sam (NSW) - Wednesday, Apr 26, 2006 at 13:58

Wednesday, Apr 26, 2006 at 13:58
Yep,

either a 2nd lock nut and/or a spring/lock washer.

i've used these and never had a problem with them coming lose, not any issues with poor contacts

cheers,
Sam.
AnswerID: 169082

Reply By: Member - Marquis - Wednesday, Apr 26, 2006 at 19:38

Wednesday, Apr 26, 2006 at 19:38
A flat washer, spring washer then nut is all that should be required.

Note consider the spring washer to be single use only in heavy vibration areas, and make sure you do not have disimilar metal problems (ie al bar to terminal to wire metals are not compatible).

Also make sure you have fuse(s) at the power source (ie at battery) and local fuses at the board rated according to the equipment attached.

If you use circuit breakers, check the curves are ok for the application. You may find correctly sized fuses are a better option.
AnswerID: 169159

Reply By: Wok - Wednesday, Apr 26, 2006 at 22:40

Wednesday, Apr 26, 2006 at 22:40
Thanks fellows,

Marquis...I am using Bussman circuit breakers, they supply data on response-times so I should be ok there.The take-offs are s/s; if there is any chemistry I expect it will be between the aluminium & terminal for the leads.I will be conformal coating the lot when fitted & tested to reduce potential problems.

Thanks again....eng
AnswerID: 169216

Follow Up By: Member - Mike DID - Thursday, Apr 27, 2006 at 08:11

Thursday, Apr 27, 2006 at 08:11
Do they specify the rupturing current ???

A starting battery can have a short-circuit current of 1500 amps - this will weld-shut small Circuit Breakers.

Mike
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FollowupID: 424586

Follow Up By: Wok - Thursday, Apr 27, 2006 at 11:24

Thursday, Apr 27, 2006 at 11:24
Mike,

3000A interrupt if I have read it correctly.

sman circuit breakers
There is more detail from the pdf link

eng
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FollowupID: 424612

Follow Up By: Wok - Thursday, Apr 27, 2006 at 11:29

Thursday, Apr 27, 2006 at 11:29
OOOOPS....didn't get the link right

Bussman circuit breakers
If that doesn't work....
www.bussauto.com/products/circprot/

eng
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FollowupID: 424614

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