Advanced Protection TWL - Manual (Page 4)

INSTALLATION PRE-PLANNING OVERVIEW:
This Surge Suppressor is probably different than anything you have seen before. You will save substantial installation time
& rework by understanding the intent behind its design and installation.
• Need to meet all applicable Codes and Regulations
• Intended for indoor use – If outdoor, the TWL assembly can be mounted in an appropriate weather-resistant
enclosure with appropriate weathertight sealing apparatus.
• Intended to be a central grounding hub for multiple individual SPDs
• There will be multiple conduits and wiring to and from the TWL
• Need appropriate wall space. There will probably be multiple SPDs attached to the side of the TWL – do not try
to cram into too small of space
• Need appropriate path to ground grid or ground – intended to use 4” copper ground strap to connect to existing
grounding grid. This path needs to be straight line, not bends or kinks.
• TWL was intended for wires to enter one side of the TWL and exit the opposite side:
- AC Power – Intended to come from upstream service entrance SPD, enter the TWL, connect to TWL-housed AC power
SPD, and conductors exit TWL to the Tower Light Controller.
- Photocell – Intended for lead from photocell to enter the DIN Rail mounted SPD, which is a series SPD. The load travels
through this SPD, which is different than the other SPDs, which are parallel-connected. The lead from the SPD goes
to the Tower Light Controller. (This SPD is ‘directional’. If the Unprotected and Protected ends are miss-connected,
the SPD will provide decreased surge protection. Direction is important!)
- Uptower loads: Leads are intended to enter the TWL at the bottom, connect to appropriate SPDs within the TWL, then
the leads exit at the top of the TWL to Uptower.
- There may be more than one way to do this. TWL includes many knockouts for customized appropriate installation.
• Commingling lower and higher voltage lines – Follow all applicable Codes
Following may be useful:
NEC 300.3(C) Conductors of Different Systems.
(1) 600 Volts, Nominal, or Less. Conductors of circuits rated 600 volts, nominal, or less, ac circuits, and DC circuits
shall be permitted to occupy the same equipment wiring enclosure, cable, or raceway. All conductors shall have
an insulation rating equal to at least the maximum circuit voltage applied to any conductor within the enclosure,
cable, or raceway.
NEC 800.53 Lightning Conductors. Where practicable, a separation of at least 1.8 m (6ft) shall be maintained
between communication wires and cables on buildings and lightning conductors.
NEC 800.133 – Communication Conductor Separation from Other Conductors
Page 1