custom electrical controlwork diy?
Sunday, August 17th, 2008 at
6:59 am
Naah! You’re Gone! Fatigue! asked:
what, if any, nec codes cover low voltage controls?(not the switching equipment like contacters, relays and starters)
Tagged with: Diy • Relays • Switching Equipment
Filed under: Do It Yourself (DIY)
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sussex electrics
Reference the current NEC and check limited energy circuits. If you do not find what you want there, read the rest of the book.
brighton electric
Try searching around article 450. Here’s one related to transformer clearances to combustible materials.
Transformer clearances from combustible surfaces per NEC 450-21.
The general requirement of NEC 450-21(a), for dry-type transformers installed indoors and rated 112½ KVA or
less, is a minimum clearance from combustible materials of 12 inches. NEC 450-21(b) requires that individual
dry-type transformers installed indoors and rated over 112½ KVA shall be installed in a transformer room of fire-
resistant construction. Sections (a) and (b) have exceptions to these requirements and both sections have an
Exception No. 2 that includes the qualifying term “completely enclosed.” This term needs further definition.
sussex electrical
There is a lot in the nec that covers low voltage, start in article 725, there are other places to look depending on what you are doing, everything has to comply with chapter 3…..
I guess you never herd of article 725, pretty common one, if you are doing low voltage controls you better start here..
Actually most of the states that adopted the nec require a licence to install “low voltage” equipment, so that may be a good start for you, here they call it a low voltage installer license, they claimed it was easy to get but a lot of the fitters couldn’t pass the test, so they have us hooking up the the thermostats again.