Quote
2002 NEC

314.23 Supports.

(F) Raceway Supported Enclosures, with Devices, Luminaires (Fixtures), or Lampholders.
An enclosure that contains a device(s) or supports a luminaire(s) [fixture(s)], lampholder, or other equipment and is supported by entering raceways shall not exceed 1650 cm3 (100 in.3) in size. It shall have threaded entries or have hubs identified for the purpose. It shall be supported by two or more conduits threaded wrenchtight into the enclosure or hubs. Each conduit shall be secured within 450 mm (18 in.) of the enclosure.

PVC is referred to in the code as Rigid Nonmetallic Conduit, so if you use two RNCs with male adapters into threaded hubs, you may well meet the code, but landscapers aim for stuff like this, IMO it will break, I would suggest using IMC or RMC for this.

Or do as hotline said and add a seperate support.

Just another opinion. [Linked Image]

Bob Badger
Construction & Maintenance Electrician
Massachusetts