Hi all,Trying to help my dad identify some wiring in his coach for a project. Manufacturer hasn't been any help so I thought I'd try here.He has two wires that we are trying to identify the wire size. Seems the obvious method would be to use a set of calipers, but he doesn't have any.Anyway, there are two stranded copper wires, each with different markings. Anyone recognize the markings or format?Wire 1: "150 FA Ground"Wire 2: "603c GLY LPS"I've not been able to find anything.Thanks in advance!

For wire 1, google says "For 150 amps in THWN wire size is 1/0"I cannot find wire 2. Perhaps compare it to wire 1, assuming it actually is 1/0. You can consult a wire table for that.I would think all you'd need is a simple ruler to measure the diameter.

Are the markings printed on the wire as if from the wire manufacturer? Or is he talking about printed labels that were possibly installed by the coach manufacturer? I only ask because a 1/0 wire is a big wire which I find hard to believe is in a factory built RV.

OP: Please post make and model of your dad's coach

The wire markings idetify the wire's FUNCTION not the size but the purpose.Beyond that I can not help.. For BIG I"m tlaking battery size big. a ruler might helpFor smaller an adjustable wrench (The one that made crescent famous) Then measure the gap in the jaws or take it (Tape over the adjuster) to the store with you.NOTE if you are trying to add to or replace a 18 ga wire and all you have is 16 or 14. NO PROBLEM. the other way around PROBLEM You can always "Go big"

Electrical Wire Identification | Good Sam Community

15 Replies

MEXICOWANDERER
Explorer
Feb 22, 2021
Image next to a fingernail?
wa8yxm
Explorer III
Feb 22, 2021
The wire markings idetify the wire's FUNCTION not the size but the purpose.

Beyond that I can not help.. For BIG I"m tlaking battery size big. a ruler might help
For smaller an adjustable wrench (The one that made crescent famous)

Then measure the gap in the jaws or take it (Tape over the adjuster) to the store with you.

NOTE if you are trying to add to or replace a 18 ga wire and all you have is 16 or 14. NO PROBLEM. the other way around PROBLEM You can always "Go big"
enblethen
Nomad
Feb 22, 2021
OP: Please post make and model of your dad's coach
opnspaces
Navigator III
Feb 22, 2021
Are the markings printed on the wire as if from the wire manufacturer? Or is he talking about printed labels that were possibly installed by the coach manufacturer? I only ask because a 1/0 wire is a big wire which I find hard to believe is in a factory built RV.
2oldman
Explorer II
Feb 22, 2021
For wire 1, google says "For 150 amps in THWN wire size is 1/0"

I cannot find wire 2. Perhaps compare it to wire 1, assuming it actually is 1/0. You can consult a wire table for that.

I would think all you'd need is a simple ruler to measure the diameter.

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Electrical Wire Identification

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