Originally Posted By: bbadger
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Richard this is an example of parallel conductors and it is a
typical practice for circuits above 200 amps.
We often have to parallel conductors for large services,
10 sets of 600 Kcmil are needed for a 4000 amp service.
However this old installation does not meet the current NEC
rules for parallel conductors.
First there is 310.4
|310.4 Conductors in Parallel.
Aluminum, copper-clad aluminum, or copper conductors
of size 1/0 AWG and larger, comprising each phase, neutral,
or grounded circuit conductor, shall be permitted to be connected
in parallel (electrically joined at both ends to form a single
As you said these conductors are 2 AWG so they are to
small to be paralleled.
Second there is the issue of two conductors under one
That said I do not know if this was wrong when it was installed,
I only know it is wrong now.
Electrical Construction & Maintenance
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