This new 2017 code language also allows the electrician to install mc cable on the underside of floor and ceiling joists assuming the electrician supports the cable at every provided joist.
Mc cable support distance.
This is also new for 2017 as permission for this method of installation did not exist prior to the 2017 code cycle.
1 fished through concealed spaces in finished buildings or structures where support is impracticable or 2 not more than 6 ft long from the last point of cable support to the point of connection to luminaires or other electrical equipment within an accessible ceiling.
This standard mandates performance tests more stringent than those required for type mc cable.
Size of conductors 14 awg to 1 awg 18 awg 2000 kcmil 14 awg 6 awg.
Mc cable must be supported every 6 ft.
Or straps hangers or similar fittings designed and installed so as not to damage the cable at intervals not exceeding 1 4 m 4 ft and within 300 mm 12 in of every cable entry into enclosures such as outlet.
General cable support.
In order to be labeled for division 1 hazardous locations type mc hl by ul the c l x cables must meet the following criteria.
Runs of nm cable must be supported at least every 54 inches.
In length from the last point of cable support to the point of connection to a luminaire or other.
The support system for cabling and equipment is a vital component of a properly designed data communications system.
Cable and cable sealing fittings for hazardous classified locations is the industry standard for this listing.
Wiring method is conduit tubing type ac cable type mc cable type mi cable nonmetallic sheathed cable or other cables a box or conduit body shall be installed at each conductor splice point outlet point switch point junction point termination point or pull point unless otherwise permitted in 300 15 a through l.
The acceptance and use of the eia tia 569 commercial building standard for telecommunications pathways and spaces by architects and engineers has proven the importance of a carefully designed and maintained cable support system.
Mc cables may be unsupported when 1 fished through concealed spaces in finished buildings 2 when not more than 6 ft.
No limit on number of conductors.
There are six major types of cable supports.
Nonmetallic sheathed cable shall be supported and secured by staples.
No limit on number of conductors.
Cable ties listed and identified for securement and support.
They also must be secured within 12 inches of an electrical box that includes a cable clamp or within eight inches of a box or enclosure without a cable clamp.
Type ac cable interlocked armor type mc cable interlocked armor type mc cable with armor bond mci a 1 number of conductors limited to no more than 4 conductors plus an equipment grounding conductor.
