sentence structure

[AUTOMOON]

XLPE-insulated cables shall incorporate a metallic, radial moisture barrier, unless a ‘wet design’ cable is specifically requested by the purchaser, and insulation electric stress limits are reduced in compliance with 1.7 and 2.3.2.

Is this sentence this way:

XLPE-insulated cables shall incorporate a metallic, radial moisture barrier, (unless a ‘wet design’ cable is specifically requested by the purchaser, and insulation electric stress limits are reduced in compliance with 1.7 and 2.3.2).

or this way:
(XLPE-insulated cables shall incorporate a metallic, radial moisture barrier, unless a ‘wet design’ cable is specifically requested by the purchaser, )(and insulation electric stress limits are reduced in compliance with 1.7 and 2.3.2.)

 

[5jj]

XLPE-insulated cables shall incorporate a metallic, radial moisture barrier, (unless a ‘wet design’ cable is specifically requested by the purchaser, and[that having been requested,] insulation electric stress limits are reduced in compliance with 1.7 and 2.3.2).

That's the way I read it.

 

[5jj]

XLPE-insulated cables shall incorporate a metallic, radial moisture barrier, (unless a ‘wet design’ cable is specifically requested by the purchaser, and[that having been requested,] insulation electric stress limits are reduced in compliance with 1.7 and 2.3.2).

That's the way I read it.