hi Just a couple questions on some parallel conductors for both AC and DC. This is from a project that I was recently on.
First of all I know that for parallel conductors the cable needs to me the following.
[FONT=Georgia, Times, Times New Roman, serif]- Be the same length.[/FONT]
- Have the same conductor material.
- Be the same size in circular mil area.
- Have the same insulation type.
- Be terminated in the same manner.
[FONT=Georgia, Times, Times New Roman, serif]- Have the same physical characteristics, where run in separate raceways or cables.[/FONT]
[FONT=Georgia, Times, Times New Roman, serif]My question on the AC parallel conductors is the following. I have 4 sets of 250 MCM Aluminum and only 3 conduits can 2 sets be installed in 1 conduit and 1 set in the other conduits or is this a violation? There is a 800 amp breaker protecting the circuit.[/FONT]
On the DC parallel conductors I was under the impression that we follow the same as AC.
The picture below shows 2 different terminations techniques for Parallel DC Conductors. First of all you have 750 MCM ALUM with a piece of 4/0 Copper type MTW/ THHW spliced via a split lug and then the wire is terminated to the lug. This is a fine cable, almost a welding type cable. The other method of termination is a 750 MCM Aluminum wire that has a solid offset pin that is terminated under a lug. Does this meet the code?
The way I see it this is a code violation. but I am being told that it is a good install.
First of all I know that for parallel conductors the cable needs to me the following.
[FONT=Georgia, Times, Times New Roman, serif]- Be the same length.[/FONT]
- Have the same conductor material.
- Be the same size in circular mil area.
- Have the same insulation type.
- Be terminated in the same manner.
[FONT=Georgia, Times, Times New Roman, serif]- Have the same physical characteristics, where run in separate raceways or cables.[/FONT]
[FONT=Georgia, Times, Times New Roman, serif]My question on the AC parallel conductors is the following. I have 4 sets of 250 MCM Aluminum and only 3 conduits can 2 sets be installed in 1 conduit and 1 set in the other conduits or is this a violation? There is a 800 amp breaker protecting the circuit.[/FONT]
On the DC parallel conductors I was under the impression that we follow the same as AC.
The picture below shows 2 different terminations techniques for Parallel DC Conductors. First of all you have 750 MCM ALUM with a piece of 4/0 Copper type MTW/ THHW spliced via a split lug and then the wire is terminated to the lug. This is a fine cable, almost a welding type cable. The other method of termination is a 750 MCM Aluminum wire that has a solid offset pin that is terminated under a lug. Does this meet the code?
The way I see it this is a code violation. but I am being told that it is a good install.