2022-2023 License and Installation Concerns Bulletin.

The Electricians' Licensing Board in conjunction with the State Electrical Inspectors, municipal electrical & building inspectors & other representatives of the electrical industry in the State of New Hampshire have put together this list of common licensing and installation concerns and problems encountered by the Board's office staff relative to the State's licensing law RSA 319-C and the administrative rules.

Tray Cable (TC) is commonly employed as the wiring method between the indoor and outdoor ductless mini-split units. Installers must be aware that type TC cable has very limited usage outside of a raceway or cable tray system per section 336.12(2). In fact, there are only (4) conditions where type TC cable is permitted to be used in this fashion:

• 336.10(4) – In outdoor locations supported by a messenger wire
• 336.10(7) – Between a cable tray and the utilization equipment or device(s), provided items (a) through (f) are met.
• 336.10(9) – In one- and two-family dwelling units, Type TC-ER-JP cable containing both power and control conductors shall be permitted for branch circuits and feeders.
• 336.10(10) – Direct buried, where identified for such use.

When using type TC cable in a one- and two-family dwelling, installers must be aware that the interior wiring must comply with Part II or Article 334 and the exterior wiring must comply with Part II of Article 340.

**The requirement for a service switch to open all ungrounded conductors at the indoor unit has been deleted per NH amendment #EL-20-17-21⁹.**