2 Answers. Conduit (RMC, IMC or EMT) is an NEC-accepted ground path. So, if the wires are in steel conduit, no OTHER ground wire is required. If that gives you concerns, you might find this link reporting research into the effectiveness of conduit as a ground relieves them.
Can EMT be used for ground?
The National Electrical Code® (NEC®) recognizes several types of conductors that are permitted to be used as equipment grounding conductors. … Under a ground fault condition, the RMC, IMC or EMT, performs as an equipment grounding conductor and will carry the return fault current.
Does conduit act as a ground?
In some installations using metal conduit, the raceway—the conduit, boxes, and connectors—serve as the ground for the circuit. In this way, the metal raceway acts in place of the grounding wire that is found in NM cable (this is also the main reason why only metal boxes may be used with metal conduit).
Can flexible metal conduit be used as a ground?
Flexible metal conduit shall be permitted as an equipment grounding conductor where all of the following conditions are met: … The circuit conductors contained in the conduit are protected by overcurrent devices rated at 20 amperes or less.
Do you need ground wire in EMT?
Conduit (RMC, IMC or EMT) is an NEC-accepted ground path. So, if the wires are in steel conduit, no OTHER ground wire is required. If that gives you concerns, you might find this link reporting research into the effectiveness of conduit as a ground relieves them.
What size conduit do I need for 12 2 wire?
For two 12/2 NM cable, you need at least 1″ conduit (by calculations below) but it’ll still be a difficult pull. For two 12/2 UF, you’ll need at least 1-1/4″ conduit.
Is flexible conduit code?
You may use flexible metal conduit in any length as long as you follow the Code rules for support (Sec. 350-18) and grounding (Sec. 250-18).
How long will EMT conduit last outside?
Typical EMT Type conduit will resist rust for a few years. It is however inevitable that it will rust. On the other hand there have been times when the conduit has rusted on parts of its surface having been exposed to the outdoor elements for one or two seasons.
Is EMT allowed in wet locations?
EMT can be used in wet locations as long as the conduit is galvanized and you use all fittings that are identified for wet locations and protected from corrosion. EMT can be used in concrete as long as the fittings are identified for use. 358.10 Uses Permitted.
Is EMT waterproof?
I would not use EMT at all. It is not weatherproof. Those compression couplers (you know, the not-setscrew ones) are not for weatherproofing, they are for better grounds.