Under NEC and CEC technical standards, cable glands must be tested using samples of the proposed cable type(s) before they can be approved for use in the intended hazardous location.
The technical standards explain what type of features the cable glands must have for each hazardous location (Division 1 or Division 2) and whether the cable gland is required to be sealed*. In turn, the standards refer to the use of a sealing compound around the exposed conductors, rather than a sealing ring or other sealing device deployed around a cable jacket, bedding or sheath.
Under NEC & CEC wiring practices, explosionproof cable glands must therefore be capable of incorporating an integral barrier seal. Not all electrical enclosures are required to be explosionproof however (see table below) and in the case of some Division 2 enclosures there is no requirement for the cable gland – or more precisely the cable – to be sealed*.
在每个危险地点中可以使用的电缆腺体有一个非常清晰的规则，这些规则可以概括如下：
I级分部1防爆外壳
| I级分部1防爆外壳 |
电缆类型允许
Class I Division 1
危险地点 |
Electrical Enclosures That Are
Required To Be Explosionproof
(With Internal Ignition Source) |
需要满足的合规标准 |
| Non-Armored Extra Hard Usage Cord & TC-ER-HL |
PXSS2K / PXSS2KREX (Barrier Seal) |
ANSI / UL 514B, ANSI / UL 1203, ANSI / UL 2225, C22.2 |
| Armored IEEE 45 & IEEE 1580 Marine Shipboard Cable |
PX2KX / PX2KXREX (Barrier Seal) |
ANSI / UL 514B, ANSI / UL 1203, ANSI / UL 2225 |
| MC-HL, ITC-HL |
TMCX / TMC2X (Barrier Seal) |
ANSI / UL 514B, ANSI / UL 1203, ANSI / UL 2225 |
| Teck 90（仅限加拿大） |
TMCX / TMC2X (Barrier Seal) (Canada Only) |
ANSI / UL 514B, ANSI / UL 2225, C22.2 |
Class I Division 2 Explosionproof Enclosures
| Class I Division 2 Explosionproof Enclosures |
电缆类型允许
Class I Division 2
危险地点 |
Electrical Enclosures That Are
Required To Be Explosionproof
(With Internal Ignition Source) |
需要满足的合规标准 |
| Non-Armored Extra Hard Usage Cord & TC-ER-HL |
PXSS2K / PXSS2KREX (Barrier Seal) |
ANSI / UL 514B, ANSI / UL 1203, ANSI / UL 2225, C22.2 |
| Other Non-Armored Tray Cable |
PXSS2K / PXSS2KREX (Barrier Seal) |
ANSI / UL 514B, ANSI / UL 1203, ANSI / UL 2225, C22.2 |
| Power Limited Tray Cable With Served Wire Armor |
PX2KW / PX2KWREX (Barrier Seal) |
ANSI / UL 514B, ANSI / UL 1203, ANSI / UL 2225, C22.2 |
| Armored IEEE 45 & IEEE 1580 Marine Shipboard Cable |
PX2KX / PX2KXREX (Barrier Seal) |
ANSI / UL 514B, ANSI / UL 1203, ANSI / UL 2225 |
| Non-Armored IEEE 45 & IEEE 1580 Marine Shipboard Cable |
PXSS2K / PXSS2KREX (Barrier Seal) |
ANSI / UL 514B, ANSI / UL 1203, ANSI / UL 2225 |
| MC-HL, ITC-HL & TECK 90 |
TMCX / TMC2X (Barrier Seal) |
ANSI / UL 514B, ANSI / UL 1203, ANSI / UL 2225 |
| Interlocked MC Armor & TECK 90 |
TMCX / TMC2X (Barrier Seal) |
ANSI / UL 514B, ANSI / UL 1203, ANSI / UL 2225, C22.2 |
I级Div 2非防爆外壳
| I类第2级非防爆外壳 |
电缆类型允许
Class I Division 2
危险地点 |
电气围栏不是
Required To Be Explosionproof
(With Internal Ignition Source) |
需要满足的合规标准 |
| Non-Armored Extra Hard Usage Cord & TC-ER-HL |
TC (No Barrier Seal) |
ANSI / UL 514B, C22.2 |
| Other Non-Armored Tray Cable |
TC (No Barrier Seal) |
ANSI / UL 514B, C22.2 |
| Power Limited Tray Cable With Served Wire Armor |
E1FW / E1FU / T3CDS (No Barrier Seal) |
ANSI / UL 514B |
| Armored IEEE 45 & IEEE 1580 Marine Shipboard Cable |
C2KX / T3CD（无屏障密封） |
ANSI / UL 514B |
| Non-Armored IEEE 45 & IEEE 1580 Marine Shipboard Cable |
TC (No Barrier Seal) |
ANSI / UL 514B |
| MC-HL, ITC-HL & TECK 90 |
TMC / TMC2（无屏障密封） |
ANSI / UL 514B |
| Interlocked MC Armor & TECK 90 |
TMC / TMC2（无屏障密封） |
ANSI / UL 514B, C22.2 |
* NB：根据NEC和CEC布线规则，“密封”的定义是安装在电缆导体周围的屏障密封件，因此在这种情况下，每当参考到“密封”时，它专门表示是防爆的固体屏障。
