Register    Login    Forum    Search    FAQ     Formula Hybrid Home Page

Board index » Technical - Design and Construction » Electrical




Post new topic Reply to topic  [ 4 posts ] 
Author Message
 Post subject: Using Chassis members as conduits
 Post Posted: Fri Nov 13, 2009 10:35 pm 
Offline

Joined: Tue Oct 30, 2007 6:50 pm
Posts: 78
Location: Illinois Tech
Hello. We were just brainstorming and someone came up with the idea of using the chassis members as conduits for the electrical connections. Is this legal?
The advantages would be that you don't have to use conduit plus the wires will be extra safe. If the main roll hoop, for example, fails then damaging the wires is the least of your concerns.
The disadvantage is that if the wire itself is damaged then you run the chance of getting shocked but the ground fault monitor should take care of that.


Top 
 Profile  
 
 Post subject:
 Post Posted: Tue Nov 17, 2009 9:25 am 
Offline
Site Admin

Joined: Tue May 16, 2006 11:34 am
Posts: 181
Location: Formula Hybrid Administration
The electrical group of the rules committee discussed this question, and though some felt uncomfortable with the idea, they elected to approve it. It will fall on the team to assure the technical inspectors that it was done safely.

The following is their response:
---------------------

The frame member in this case, would qualify as an electrical conduit. You would have to use bulkhead fittings and strain relief where the wire enters and exits the tubing, and all frame members containing HV wiring must be clearly marked with orange. You must be careful about the angle at which the wire exists the frame member as well, large wire doesn’t make sharp turns.

One concern, however, is that the inside of frame members can be quite rough in the vicinity of welds, and could penetrate the insulation. The electrical inspectors will want to see some proof that the inside of the chassis members being used as conduit are smooth and free of anything that may compromise the insulation of the wire. Also, any work on the frame such as adding new mounts, etc when the wiring is in place would likely destroy the insulation of the wire.


Top 
 Profile  
 
 Post subject: Documented Conduit
 Post Posted: Sun Mar 28, 2010 7:55 pm 
Offline

Joined: Mon Jun 01, 2009 3:30 pm
Posts: 17
Location: Element One: Lawrence Tech University
I am sure I am not the only person who would like this clarified, as this ruling seems to be the complete opposite of anything suggested in the rules (while practiced commercially, the ruling result seemed surprising based on the few restrictions listed being overturned).

Could we begin a thread or page to document all accepted conduit. This ruling just seems to throw out the whole 4.3 Rules section.

For example:

In the case of HV communication wire (i.e. voltage dividers for voltage measurement). Could we use something smaller than LNMP conduit such as brake line tubing? As well, are most liquidtight conduits (such as CARLON's) also allowable?


I apologize if any of this sounds angry or even offensive. I mean neither, but am just interested to bring more definitive resolution to this debate. What guidelines do we have that prevents us from using traditional utility conduit that is painted orange?


Top 
 Profile  
 
 Post subject:
 Post Posted: Thu Apr 22, 2010 4:00 pm 
Offline
Site Admin

Joined: Tue May 16, 2006 11:34 am
Posts: 181
Location: Formula Hybrid Administration
NOTE:

The rules committee wishes to clarify that using the frame as conduit for
HV wiring is ONLY allowed for conductors outside the accumulator enclosures,
and only if they are after the accumulator contactors such that a ground
fault will de-energize the relevant cable section.

Formula Hybrid Rules Committee


Top 
 Profile  
 
Display posts from previous:  Sort by  
 
Post new topic Reply to topic  [ 4 posts ] 

Board index » Technical - Design and Construction » Electrical


Who is online

Users browsing this forum: No registered users and 2 guests

 
 

 
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron