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nuckolls.bob(at)aeroelect
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 Posted: Fri Aug 20, 2010 11:29 am Post subject: Battery cables and Firewall Penetrations |
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At 11:58 PM 8/19/2010, you wrote:
That particular Terminal Feed Through Connector is only rated 250A (at)48VDC. You would probably be better served purchasing the 400A (at)48VDC version from Blue Sea Systems.
http://bluesea.com/products/2206
They also carry both Black and Red and they are identical to the ones on Ebay except in a larger amperage rating and slightly larger physical size. I wouldn’t be surprised if they were cheaper from Blue Sky either. $11/each seems kinda pricey to me.
[img]cid:.0[/img][/b]
But are price, voltage and current ratings the only
features of concern? You're going to poke a substantial
hole in a "firewall" that's ostensibly configured
to keep products of a fuel-fed fire out of the cockpit.
Then you propose to plug that hole with some form of
plastic.
Here's a trip to the assembly line of one manufacturer
that has spent several decades of time, talent and
resources developing techniques for bringing stuff
through the fire wall but without compromising
fire wall integrity.
http://www.aeroelectric.com/articles/Firewall_Penetration/firewall.html
I'll further quote from AC43-13 which is one of
many documents where we are admonished to be aware
of the flame retarding characteristics of devices
that penetrate the firewall:
11-232. TYPES OF CONNECTORS.
Connectors must be identified by an original
identification number derived from MIL
Specification (MS) or OAM specification.
Figure 11-35 provides some examples of MS
connector types. Several different types are
shown in figures 11-36 and 11-37.
a. Environmental Classes. Environment-
resistant connectors are used in applications
where they will probably be subjected to
fluids, vibration, thermal, mechanical shock,
corrosive elements, etc. Firewall class connectors
incorporating these same features
should, in addition, be able to prevent the
penetration of the fire through the aircraft
firewall connector opening and continue to
function without failure for a specified period
of time when exposed to fire.
So unless you're changing the name of of
your firewall to "engine compartment aft
bulkhead", I'll suggest there is value in
attending to maintenance of firewall
integrity.
Bob . . .
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jndleyden(at)comcast.net
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| Posted: Fri Aug 20, 2010 12:44 pm Post subject: Battery cables and Firewall Penetrations |
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Ooops!
You are absolutely correct. I misread what he was asking for and thought he meant the aft bulkhead and not the engine firewall. But, before I would discount the use of the connectors that had been previously mentioned I would still contact the manufacturer and inquire as to the serviceability of that particular connector. You might find that it actually fits the bill perfectly.
Jim
From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Robert L. Nuckolls, III
Sent: Friday, August 20, 2010 3:29 PM
To: aeroelectric-list(at)matronics.com
Subject: Battery cables and Firewall Penetrations
At 11:58 PM 8/19/2010, you wrote:
That particular Terminal Feed Through Connector is only rated 250A (at)48VDC. You would probably be better served purchasing the 400A (at)48VDC version from Blue Sea Systems.
http://bluesea.com/products/2206
They also carry both Black and Red and they are identical to the ones on Ebay except in a larger amperage rating and slightly larger physical size. I wouldnt be surprised if they were cheaper from Blue Sky either. $11/each seems kinda pricey to me.
[img]cid:image001.jpg(at)01CB4083.E7E4DC20[/img]
But are price, voltage and current ratings the only
features of concern? You're going to poke a substantial
hole in a "firewall" that's ostensibly configured
to keep products of a fuel-fed fire out of the cockpit.
Then you propose to plug that hole with some form of
plastic.
Here's a trip to the assembly line of one manufacturer
that has spent several decades of time, talent and
resources developing techniques for bringing stuff
through the fire wall but without compromising
fire wall integrity.
http://www.aeroelectric.com/articles/Firewall_Penetration/firewall.html
I'll further quote from AC43-13 which is one of
many documents where we are admonished to be aware
of the flame retarding characteristics of devices
that penetrate the firewall:
11-232. TYPES OF CONNECTORS.
Connectors must be identified by an original
identification number derived from MIL
Specification (MS) or OAM specification.
Figure 11-35 provides some examples of MS
connector types. Several different types are
shown in figures 11-36 and 11-37.
a. Environmental Classes. Environment-
resistant connectors are used in applications
where they will probably be subjected to
fluids, vibration, thermal, mechanical shock,
corrosive elements, etc. Firewall class connectors
incorporating these same features
should, in addition, be able to prevent the
penetration of the fire through the aircraft
firewall connector opening and continue to
function without failure for a specified period
of time when exposed to fire.
So unless you're changing the name of of
your firewall to "engine compartment aft
bulkhead", I'll suggest there is value in
attending to maintenance of firewall
integrity.
Bob . . .
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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tim2542(at)sbcglobal.net
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| Posted: Fri Aug 20, 2010 6:07 pm Post subject: Battery cables and Firewall Penetrations |
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Any idea where you can get such a fitting Bob? The ones I see at ACS look like they would cut insulation.
Thanks, Tim
(rnbraud(at)yahoo.com)
From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Robert L. Nuckolls, III
Sent: Friday, August 20, 2010 12:29 PM
To: aeroelectric-list(at)matronics.com
Subject: Battery cables and Firewall Penetrations
At 11:58 PM 8/19/2010, you wrote:
That particular Terminal Feed Through Connector is only rated 250A (at)48VDC. You would probably be better served purchasing the 400A (at)48VDC version from Blue Sea Systems.
http://bluesea.com/products/2206
They also carry both Black and Red and they are identical to the ones on Ebay except in a larger amperage rating and slightly larger physical size. I wouldn’t be surprised if they were cheaper from Blue Sky either. $11/each seems kinda pricey to me.
[img]cid:image001.jpg(at)01CB409A.67D143E0[/img]
But are price, voltage and current ratings the only
features of concern? You're going to poke a substantial
hole in a "firewall" that's ostensibly configured
to keep products of a fuel-fed fire out of the cockpit.
Then you propose to plug that hole with some form of
plastic.
Here's a trip to the assembly line of one manufacturer
that has spent several decades of time, talent and
resources developing techniques for bringing stuff
through the fire wall but without compromising
fire wall integrity.
http://www.aeroelectric.com/articles/Firewall_Penetration/firewall.html
I'll further quote from AC43-13 which is one of
many documents where we are admonished to be aware
of the flame retarding characteristics of devices
that penetrate the firewall:
11-232. TYPES OF CONNECTORS.
Connectors must be identified by an original
identification number derived from MIL
Specification (MS) or OAM specification.
Figure 11-35 provides some examples of MS
connector types. Several different types are
shown in figures 11-36 and 11-37.
a. Environmental Classes. Environment-
resistant connectors are used in applications
where they will probably be subjected to
fluids, vibration, thermal, mechanical shock,
corrosive elements, etc. Firewall class connectors
incorporating these same features
should, in addition, be able to prevent the
penetration of the fire through the aircraft
firewall connector opening and continue to
function without failure for a specified period
of time when exposed to fire.
So unless you're changing the name of of
your firewall to "engine compartment aft
bulkhead", I'll suggest there is value in
attending to maintenance of firewall
integrity.
Bob . . .
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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nuckolls.bob(at)aeroelect
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| Posted: Fri Aug 20, 2010 6:15 pm Post subject: Battery cables and Firewall Penetrations |
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At 09:06 PM 8/20/2010, you wrote:
| Quote: | Any idea where you can get such a fitting Bob? The ones I see at ACS look like they would cut insulation.
Thanks, Tim
|
Which ACS catalog number are you looking at?
Bob . . .
[quote][b]
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tim2542(at)sbcglobal.net
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| Posted: Fri Aug 20, 2010 8:04 pm Post subject: Battery cables and Firewall Penetrations |
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These: http://www.aircraftspruce.com/catalog/appages/firewallshields.php
I like the idea of the 90° bend but have not seen anything close.
Tim
(rnbraud(at)yahoo.com)
From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Robert L. Nuckolls, III
Sent: Friday, August 20, 2010 7:15 PM
To: aeroelectric-list(at)matronics.com
Subject: RE: Battery cables and Firewall Penetrations
At 09:06 PM 8/20/2010, you wrote:
Any idea where you can get such a fitting Bob? The ones I see at ACS look like they would cut insulation.
Thanks, Tim
Which ACS catalog number are you looking at?
Bob . . . | Quote: | | http://www.matronics.com/Navigator?AeroElectric-List |
0123456789
No virus found in this incoming message.
Checked by AVG - www.avg.com
11:35:00
[quote][b]
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harley(at)AgelessWings.co
Guest
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| Posted: Sat Aug 21, 2010 3:34 am Post subject: Battery cables and Firewall Penetrations |
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Tim... (if I may interrupt here, Bob...)
Those ACS fittings you are referring to, Tim, are designed to take grommets inside the holes (except the small one which already has a rubber backing) to prevent damage to the wire.
From the description on the ACS page:
Both types of shield ... accommodate rubber grommets up to outside diameter. Actual hole size in 2 piece shields is slightly larger than indicated to prevent chafing cable...Use grommets that fit tightly around the cable or wire to insure a good seal.
Harley
On 8/21/2010 12:02 AM, Tim Andres wrote: [quote] v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} <![endif]--> st1\:*{behavior:url(#default#ieooui) } <![endif]-->
These: http://www.aircraftspruce.com/catalog/appages/firewallshields.php
I like the idea of the 90° bend but have not seen anything close.
Tim
From: owner-aeroelectric-list-server(at)matronics.com (owner-aeroelectric-list-server(at)matronics.com) [mailto:owner-aeroelectric-list-server(at)matronics.com (owner-aeroelectric-list-server(at)matronics.com)] On Behalf Of Robert L. Nuckolls, III
Sent: Friday, August 20, 2010 7:15 PM
To: aeroelectric-list(at)matronics.com (aeroelectric-list(at)matronics.com)
Subject: RE: Battery cables and Firewall Penetrations
At 09:06 PM 8/20/2010, you wrote:
Any idea where you can get such a fitting Bob? The ones I see at ACS look like they would cut insulation.
Thanks, Tim
Which ACS catalog number are you looking at?
Bob . . . 0 1 2
No virus found in this incoming message.
Checked by AVG - www.avg.com
11:35:00
3 [b]
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