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Old 06-20-2019, 05:26 PM   #1
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Default Tin-plated Copper

Tin-plated copper looks just like aluminum . Is there anything in the code that mentions this type of conductor and if the ampacity needs to be derated?

Specs:
10 AWG
Stranded
Strand Count 105/30
Current 58A @ 86F
300V AC
OD 0.16"
Insulation PVC Plastic
Wire Material Tin Plated Copper
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Old 06-24-2019, 08:58 PM   #2
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Default this is the reply I got from the Ontario inspector on “AWM” wire:

Bulletin 12-31-2
Application of appliance wiring material (AWM)
Rules 12-020 and 12-100
Issued January 2016
Supersedes Bulletin 12-31-1
Issue
Issues have arisen in Ontario with Appliance Wiring Material (AWM) conductors and cables that have been incorrectly used as part of a building wiring infrastructure during the installation of industrial machines and equipment. AWM is approved for internal and interconnecting wiring of equipment and is intended to be factory-installed or factory-provided components of complete equipment.
Direction
AWM cables are not approved for use in building wiring systems.
Background
The Ontario Electrical Safety Code (OESC) does not permit the use of AWM for building wiring and does not permit its installation in raceways that are attached to building structures or in or under concrete slabs (See Figure B1). For installations of building wiring, conductors and cables shall meet the installation requirements of OESC Section 12; and be suitable for the conditions of use as per Table 19.
The only rule where the OESC recognizes the use of AWM is Rule 12-020, which permits it to be used for wiring installations under a raised floor to connect to or interconnect data processing or similar equipment under specific conditions. Dual approved AWM that is certified and marked as such will be acceptable as per its certification. An example is AWM that is certified and marked as both AWM and TC (tray cable) may be installed in a cable tray as permitted by Rule 12-2202, considering all manufacturer installation recommendations and/or restrictions, if any.
CSA Standard C22.2 No 210 covers AWM products. It refers to single conductor and multi-conductor (round, parallel and flat types) wiring material products with optional coverings, jackets and shields, insulation of thermoset, thermoplastic and composite materials. The scope of the standard limits the application of AWM to the internal wiring and interconnection of equipment only.
Understanding the cable’s operating environment avoids unanticipated failures from exposure to aggressive oils, fuels and solvents, excessive heat or cold, and expected flexing nature of the cable. Some identified AWM cables’ issues are:
• The flame rating of AWM can vary greatly. In certain instances, AWM can meet the bare minimum flammability (FT1 vertical test) or maximum flammability (FT6 plenum test). Under specific conditions, certain types of AWM will catch and spread fire; as an example, what can happen to certain AWM types when the maximum current is exceeded in a bundle located in a high temperature type of environment.
• The mechanical characteristics of AWM can also vary greatly; the CSA standard does not specify the thickness of insulation, therefore in some instances, the insulation thickness can be very thin, providing virtually no mechanical protection where the slightest abrasion will expose conductors, creating hazardous and possibly life threatening conditions.

The misapplication of AWM product causes a significant financial impact to customers when the Authority having jurisdiction (ESA) rejects the installation. Non-compliance can lead to costly re-working or contractual penalties. Ontario Electrical Safety Code – Bulletins
©Electrical Safety Authority Page 2 of 2

Figure B1 - AWM cable shall not be used for building wiring in cable trays attached to building structures, or in raceways attached to building structures or in/under slab raceways
AWM cable may be used where the cable is part of an approved assembly and is not installed in building wiring systems (e.g. conveyor and assembly type equipment) as shown in Figure B2.
Figure B2 – AWM cable can be used as part of an approved assemblyOntario Electrical Safety Code – Bulletins
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Old 06-26-2019, 08:32 PM   #3
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Yes....buy a code book and look at the listing of approved wiring and cables...that's all the Inspector wants to see on the job .
Tin plated wire is good stuff to use for a marine / boat environment....not shore power outlets though .
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Old 06-27-2019, 05:25 AM   #4
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Quote:
Originally Posted by scotch View Post
Yes....buy a code book and look at the listing of approved wiring and cables...that's all the Inspector wants to see on the job .
Tin plated wire is good stuff to use for a marine / boat environment....not shore power outlets though .
Hello,
Thank you for the response.


I think what I was looking for in the code book was some mention of where AWM can be used. But I suppose if it is not noted in Table 19 than that implies it is not suitable for raceways.
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Old 06-27-2019, 12:55 PM   #5
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Welcome Kyle.
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